{"id":6251,"date":"2026-10-09T18:55:11","date_gmt":"2026-10-09T18:55:11","guid":{"rendered":"https:\/\/www.mailercloud.com\/blog\/?p=6251"},"modified":"2026-10-09T19:01:44","modified_gmt":"2026-10-09T19:01:44","slug":"smtp-relay-services","status":"publish","type":"post","link":"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services","title":{"rendered":"8 Best SMTP Relay Services in 2026 (Pricing Compared)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>Last updated: October 2026 | Pricing checked on October 9, 2026 | 10 min read<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An SMTP relay service sends email from your website, app or business software through a dedicated, authenticated mail server instead of your own. That matters because emails sent straight from a web server or a shared host often land in spam, or never arrive at all.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We compared eight SMTP relay services on price at 10,000, 50,000 and 100,000 emails a month, free plans and trials, ease of setup and deliverability tools. Prices come from each provider\u2019s pricing page on October 9, 2026.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our pick for most small businesses and SaaS teams is the <strong>Mailercloud Email API<\/strong>. It supports both SMTP relay and a REST API, costs $10\/month for 50,000 emails, and comes with a 14-day free trial. Amazon SES is cheaper per email at high volume if you have developers to manage it.<\/p>\n\n\n\n<div style=\"background:#f0f4ff; border-left:4px solid #2B5CE6; padding:14px 20px; border-radius:0 6px 6px 0; margin:22px 0;\">\n  <p style=\"margin:0; font-size:15px; color:#2d3748; line-height:1.65;\"><strong>Quick Answer:<\/strong> <strong>The Mailercloud Email API is the best SMTP relay service in 2026<\/strong> for small businesses and SaaS teams: SMTP relay and REST API for <strong>$10\/month for 50,000 emails<\/strong> (SendGrid Essentials: $19.95), with a 14-day free trial. <strong>Amazon SES<\/strong> is cheapest at high volume ($0.10 per 1,000) for developer teams, <strong>Postmark<\/strong> is best for fast transactional email, and <strong>Mailgun<\/strong> suits teams that need detailed logs.<\/p>\n<\/div>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#What_Is_an_SMTP_Relay_Service\" >What Is an SMTP Relay Service?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#What_to_Look_For\" >What to Look For<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#SMTP_Relay_Services_at_a_Glance\" >SMTP Relay Services at a Glance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#1_Mailercloud_Email_API_%E2%80%94_Best_Overall_SMTP_Relay\" >1. Mailercloud Email API \u2014 Best Overall SMTP Relay<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#2_Amazon_SES_%E2%80%94_Cheapest_at_High_Volume\" >2. Amazon SES \u2014 Cheapest at High Volume<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#3_Postmark_%E2%80%94_Best_for_Transactional_Speed\" >3. Postmark \u2014 Best for Transactional Speed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#4_Mailgun_%E2%80%94_Best_for_Developers_Who_Need_Logs\" >4. Mailgun \u2014 Best for Developers Who Need Logs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#5_SendGrid_%E2%80%94_Best_Ecosystem\" >5. SendGrid \u2014 Best Ecosystem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#6_SMTP2GO_%E2%80%94_Best_for_Simple_SMTP_Setup\" >6. SMTP2GO \u2014 Best for Simple SMTP Setup<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#7_SparkPost_%E2%80%94_Best_for_High-Volume_Senders\" >7. SparkPost \u2014 Best for High-Volume Senders<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#8_Brevo_%E2%80%94_Best_Free_Daily_Allowance\" >8. Brevo \u2014 Best Free Daily Allowance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#SMTP_Relay_Pricing_at_10000_50000_and_100000_Emails\" >SMTP Relay Pricing at 10,000, 50,000 and 100,000 Emails<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#The_Mailercloud_View_Get_the_Basics_Right_Before_You_Pick_a_Relay\" >The Mailercloud View: Get the Basics Right Before You Pick a Relay<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#How_to_Choose\" >How to Choose<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.mailercloud.com\/blog\/smtp-relay-services\/#Final_Verdict\" >Final Verdict<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"what-is-an-smtp-relay-service\"><span class=\"ez-toc-section\" id=\"What_Is_an_SMTP_Relay_Service\"><\/span>What Is an SMTP Relay Service?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP (Simple Mail Transfer Protocol, defined in <a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc5321\" target=\"_blank\" rel=\"noopener nofollow\">RFC 5321<\/a>) is how email moves between servers. An SMTP relay accepts mail from your app or device and delivers it on your behalf, using servers and IP addresses that mailbox providers already trust. Our <a href=\"https:\/\/www.mailercloud.com\/blog\/smtp-understanding-the-simple-mail-transfer-protocol\">guide to SMTP<\/a> explains how the protocol works in more detail.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You use one when you need to send:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Transactional email:<\/strong> password resets, receipts, order and shipping updates<\/li>\n\n\n<li><strong>App and website notifications:<\/strong> contact form alerts, account messages<\/li>\n\n\n<li><strong>Email from devices and business software:<\/strong> printers, CRMs, help desks, WordPress plugins<\/li>\n\n<\/ul>\n\n\n\n<div style=\"background:#fffbea;border:1px solid #f6e05e;border-radius:8px;padding:14px 18px;margin:22px 0;\"><p style=\"margin:0;font-size:15px;color:#2d3748;line-height:1.65;\"><strong>Sidenote:<\/strong> An SMTP relay is not the same as an email marketing platform. Relays send the messages your systems generate. For newsletters and campaigns to a list, you need a marketing tool. Some providers, like Mailercloud and Brevo, offer both in one account.<\/p><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-to-look-for\"><span class=\"ez-toc-section\" id=\"What_to_Look_For\"><\/span>What to Look For<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Price at your volume<\/strong>, including what happens when you go over.<\/li>\n\n\n<li><strong>Authentication support:<\/strong> SPF (<a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc7208\" target=\"_blank\" rel=\"noopener nofollow\">RFC 7208<\/a>), DKIM (<a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc6376\" target=\"_blank\" rel=\"noopener nofollow\">RFC 6376<\/a>) and DMARC (<a href=\"https:\/\/dmarc.org\/\" target=\"_blank\" rel=\"noopener nofollow\">dmarc.org<\/a>) on your own domain.<\/li>\n\n\n<li><strong>TLS encryption<\/strong> on submission ports 587 or 465 (<a href=\"https:\/\/datatracker.ietf.org\/doc\/html\/rfc8314\" target=\"_blank\" rel=\"noopener nofollow\">RFC 8314<\/a>). See our guide to <a href=\"https:\/\/www.mailercloud.com\/blog\/choosing-right-smtp-ports-25-465-587\">choosing the right SMTP port<\/a>.<\/li>\n\n\n<li><strong>Logs and analytics<\/strong> to see what was delivered, bounced or blocked.<\/li>\n\n\n<li><strong>A free plan or trial<\/strong> to test before you commit.<\/li>\n\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"smtp-relay-services-at-a-glance\"><span class=\"ez-toc-section\" id=\"SMTP_Relay_Services_at_a_Glance\"><\/span>SMTP Relay Services at a Glance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div style=\"max-width:100%;overflow-x:auto;margin:24px 0;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,0.08);\">\n  <table style=\"width:100%;border-collapse:collapse;background:#fff;min-width:860px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n    <thead><tr style=\"background:linear-gradient(135deg,#1e3a5f 0%,#2b6cb0 100%);\"><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;border-radius:12px 0 0 0;\">Service<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;\">Best For<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;\">Price at 50,000<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;\">Free Option<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;border-radius:0 12px 0 0;\">Standout<\/th><\/tr><\/thead>\n    <tbody>\n      <tr style=\"background:linear-gradient(90deg,#ebf8ff 0%,#fff 100%);border-left:4px solid #2b6cb0;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">Mailercloud Email API<span style=\"display:inline-block;background:#2b6cb0;color:#fff;font-size:10px;font-weight:700;padding:2px 7px;border-radius:20px;margin-left:6px;vertical-align:middle;letter-spacing:0.3px;text-transform:uppercase;\">Our Pick<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">SMB &amp; SaaS<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"font-weight:700;color:#276749;white-space:nowrap;\">$10 (50K)<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#276749;font-weight:600;\">14-day trial<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">SMTP + API<\/td><\/tr>\n      <tr style=\"border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">Amazon SES<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">High volume on AWS<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"font-weight:700;color:#276749;white-space:nowrap;\">$5 (50K)<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#d69e2e;font-weight:600;\">Pay as you go<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$0.10 per 1,000<\/td><\/tr>\n      <tr style=\"border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">Postmark<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Transactional speed<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Scales (from $15\/10K)<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#276749;font-weight:600;\">100\/month<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Message streams<\/td><\/tr>\n      <tr style=\"border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">Mailgun<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Logs &amp; inbound<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$35 (50K)<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#276749;font-weight:600;\">100\/day<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">30-day logs on Scale<\/td><\/tr>\n      <tr style=\"border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">SendGrid<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Ecosystem<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$19.95 (50K)<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#d69e2e;font-weight:600;\">60-day trial<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">SDKs, plugins<\/td><\/tr>\n      <tr style=\"border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">SMTP2GO<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Simple SMTP setup<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Scales (from $15)<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#276749;font-weight:600;\">1,000\/month<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Phone support<\/td><\/tr>\n      <tr style=\"border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">SparkPost<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">High-volume analytics<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$15 (50K)<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#276749;font-weight:600;\">Test plan<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Deep analytics<\/td><\/tr>\n      <tr style=\"border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;white-space:nowrap;vertical-align:middle;\">Brevo<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Free daily relay<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">By emails (from $9)<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\"><span style=\"color:#276749;font-weight:600;\">300\/day<\/span><\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Marketing + SMTP<\/td><\/tr>\n    <\/tbody>\n  <\/table>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-mailercloud-email-api-best-overall-smtp-relay\"><span class=\"ez-toc-section\" id=\"1_Mailercloud_Email_API_%E2%80%94_Best_Overall_SMTP_Relay\"><\/span>1. Mailercloud Email API \u2014 Best Overall SMTP Relay<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Mailercloud Email API is the best SMTP relay service for small businesses and SaaS teams in 2026.<\/strong> It costs $10\/month for 50,000 emails, which is half SendGrid\u2019s Essentials price for the same volume ($19.95). You can send by SMTP relay or REST API, so it works with WordPress plugins, CRMs and custom apps alike.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The same account also gives you Mailercloud\u2019s email marketing platform. That means one vendor and one domain setup for both transactional and marketing email. You also get the <a href=\"https:\/\/www.mailercloud.com\/features\/email-verifier\/\">email verifier<\/a> to clean addresses before they bounce, and <a href=\"https:\/\/www.mailercloud.com\/features\/inbox-tracker\/\">Inbox Tracker<\/a> to see where your mail lands.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At 100,000 emails a month you\u2019d move to the $100 plan (500,000 emails), so Mailgun\u2019s Scale plan ($90) is slightly cheaper at exactly that volume. Mailercloud\u2019s integration library is also smaller than SendGrid\u2019s.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"key-features\">Key features<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SMTP relay and REST API<\/li>\n\n\n<li>$10\/month for 50,000 emails; $100 for 500,000; $450 for 2.5 million<\/li>\n\n\n<li>14-day free trial<\/li>\n\n\n<li>SPF, DKIM and DMARC setup for your own domain<\/li>\n\n\n<li>Delivery logs and analytics<\/li>\n\n\n<li>Email marketing, verifier and Inbox Tracker in the same account<\/li>\n\n<\/ul>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>Mailercloud Email API Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>$10\/month for 50,000 emails, half SendGrid Essentials<\/li>\n    <li>SMTP relay and REST API on every plan<\/li>\n    <li>14-day free trial<\/li>\n    <li>Email marketing, verifier and Inbox Tracker in the same account<\/li>\n    <li>Clear tiers: $100 for 500,000 and $450 for 2.5 million<\/li>\n    <li>SPF, DKIM and DMARC setup for your own domain<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>Mailercloud Email API Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>At exactly 100,000 emails you need the $100 plan (Mailgun Scale is $90)<\/li>\n    <li>Smaller SDK and plugin ecosystem than SendGrid<\/li>\n    <li>No permanent free plan<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> <strong>$10\/month<\/strong> for 50,000 emails; $100 for 500,000; $450 for 2.5M. 14-day free trial.<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pricing:<\/strong> <a href=\"https:\/\/www.mailercloud.com\/features\/email-api\/?source=blog&amp;utm_source=blog&amp;utm_medium=organic&amp;utm_campaign=listicle_smtp_relay_services\">$10\/month for 50,000 emails, $100 for 500,000, $450 for 2.5 million; 14-day free trial<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> Small businesses and SaaS teams sending up to 50,000 emails a month.<\/p>\n\n\n\n<div style=\"display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;background:#fff;border:1px solid #d6e4f5;border-left:4px solid #2b6cb0;border-radius:10px;padding:16px 20px;margin:24px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;\">\n  <div style=\"display:flex;align-items:center;gap:12px;flex:1 1 320px;\"><p style=\"margin:0;font-size:14.5px;color:#2d3748;line-height:1.5;\"><strong>Try the Mailercloud Email API<\/strong> &mdash; SMTP relay and API, $10\/month for 50,000 emails, with a 14-day free trial.<\/p><\/div>\n  <a href=\"https:\/\/app.mailercloud.com\/register?source=blog&amp;utm_source=blog&amp;utm_medium=organic&amp;utm_campaign=listicle_smtp_relay_services_mid\" style=\"display:inline-block;background:#2b6cb0;color:#fff;font-size:14px;font-weight:600;text-decoration:none;padding:10px 20px;border-radius:999px;white-space:nowrap;\">Start free trial&nbsp;&rarr;<\/a>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-amazon-ses-cheapest-at-high-volume\"><span class=\"ez-toc-section\" id=\"2_Amazon_SES_%E2%80%94_Cheapest_at_High_Volume\"><\/span>2. Amazon SES \u2014 Cheapest at High Volume<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Amazon Simple Email Service charges $0.10 per 1,000 emails, the lowest per-email price here. That\u2019s $5 for 50,000 emails and $10 for 100,000, plus small charges for attachments and optional extras like dedicated IPs ($24.95\/month per IP).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The catch is setup. SES is built for developers. New accounts start in a &#8220;sandbox&#8221; and must request production access, and logs and analytics need extra AWS services. There\u2019s no support beyond AWS\u2019s paid support plans.<\/p>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>Amazon SES Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Lowest price per email: $0.10 per 1,000<\/li>\n    <li>Scales to very high volume<\/li>\n    <li>Fits naturally if you already use AWS<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>Amazon SES Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Developer-heavy setup and sandbox approval<\/li>\n    <li>Logs and dashboards need extra AWS services<\/li>\n    <li>No hands-on support without a paid AWS plan<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> <strong>$0.10 per 1,000 emails<\/strong>; dedicated IPs $24.95\/month each.<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> Developer teams already on AWS sending at high volume.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-postmark-best-for-transactional-speed\"><span class=\"ez-toc-section\" id=\"3_Postmark_%E2%80%94_Best_for_Transactional_Speed\"><\/span>3. Postmark \u2014 Best for Transactional Speed<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Postmark focuses only on transactional email and is known for fast delivery and clear logs. It separates transactional and broadcast mail into different &#8220;message streams&#8221; to protect deliverability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The free developer plan covers 100 emails a month. Basic costs $15\/month for 10,000 emails, with extra emails at $1.80 per 1,000. Pro and Platform plans ($16.50 and $18 at 10,000) add longer retention and more servers.<\/p>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>Postmark Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Fast, reliable transactional delivery<\/li>\n    <li>Clear, searchable message logs<\/li>\n    <li>Separate streams for transactional and broadcast mail<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>Postmark Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>More expensive per email at higher volume<\/li>\n    <li>Free plan is only 100 emails a month<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> Free (100 emails\/month); Basic <strong>$15\/month<\/strong> for 10,000 emails; extra $1.80 per 1,000.<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> Apps where password resets and receipts must arrive in seconds.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-mailgun-best-for-developers-who-need-logs\"><span class=\"ez-toc-section\" id=\"4_Mailgun_%E2%80%94_Best_for_Developers_Who_Need_Logs\"><\/span>4. Mailgun \u2014 Best for Developers Who Need Logs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Mailgun offers SMTP relay and a powerful API, with flexible inbound routing and email validation. Plans include longer log retention as you move up: 1 day on Basic, 5 days on Foundation and 30 days on Scale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The free plan allows 100 emails a day. Basic costs $15\/month for 10,000 emails, Foundation $35 for 50,000, and Scale $90 for 100,000. Compare it with SendGrid in our <a href=\"https:\/\/www.mailercloud.com\/blog\/sendgrid-vs-mailgun\">SendGrid vs Mailgun<\/a> comparison.<\/p>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>Mailgun Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Strong API and inbound routing<\/li>\n    <li>30-day logs on Scale<\/li>\n    <li>Email validation included on higher plans<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>Mailgun Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Short log retention on Basic (1 day)<\/li>\n    <li>Costs more than Mailercloud at 50,000 emails<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> Free (100\/day); Basic <strong>$15<\/strong> (10K); Foundation $35 (50K); Scale $90 (100K).<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> Developer teams that need detailed logs and inbound email. If Mailgun\u2019s pricing doesn\u2019t fit, see our <a href=\"https:\/\/www.mailercloud.com\/blog\/mailgun-alternatives\">Mailgun alternatives<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"5-sendgrid-best-ecosystem\"><span class=\"ez-toc-section\" id=\"5_SendGrid_%E2%80%94_Best_Ecosystem\"><\/span>5. SendGrid \u2014 Best Ecosystem<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Twilio SendGrid has the largest ecosystem of SDKs, plugins and tutorials, and it\u2019s built into many third-party apps. There\u2019s a 60-day free trial (100 emails a day).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Essentials costs $19.95\/month for up to 50,000 emails, and Pro $89.95\/month for 100,000, which adds a dedicated IP. See our list of <a href=\"https:\/\/www.mailercloud.com\/blog\/sendgrid-alternatives\">SendGrid alternatives<\/a> if price is a concern.<\/p>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>SendGrid Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Largest ecosystem of SDKs and integrations<\/li>\n    <li>Dedicated IP on Pro<\/li>\n    <li>Marketing Campaigns available in the same account<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>SendGrid Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>No permanent free plan (60-day trial)<\/li>\n    <li>Essentials costs about twice Mailercloud at 50,000 emails<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> 60-day trial; Essentials <strong>$19.95\/month<\/strong> (50K); Pro $89.95\/month (100K).<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> Teams that need wide SDK and integration support.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"6-smtp2go-best-for-simple-smtp-setup\"><span class=\"ez-toc-section\" id=\"6_SMTP2GO_%E2%80%94_Best_for_Simple_SMTP_Setup\"><\/span>6. SMTP2GO \u2014 Best for Simple SMTP Setup<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP2GO is built around plain SMTP relay, which makes it easy to connect printers, CRMs, WordPress and other business software. It has a free plan for up to 1,000 emails a month, and paid plans start at $15\/month. Paid plans include ticket, chat and phone support, and yearly billing gets 2 months free.<\/p>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>SMTP2GO Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Very easy SMTP setup for business software<\/li>\n    <li>Free plan for 1,000 emails a month<\/li>\n    <li>Phone, chat and ticket support on paid plans<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>SMTP2GO Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Smaller ecosystem than SendGrid or Mailgun<\/li>\n    <li>Reporting is shorter on lower plans (30 days)<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> Free (1,000\/month); paid from <strong>$15\/month<\/strong>.<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> Small businesses relaying email from everyday software.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"7-sparkpost-best-for-high-volume-senders\"><span class=\"ez-toc-section\" id=\"7_SparkPost_%E2%80%94_Best_for_High-Volume_Senders\"><\/span>7. SparkPost \u2014 Best for High-Volume Senders<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SparkPost (part of Bird) is built for large senders, with detailed analytics and deliverability insights. The Test plan is free for small volumes. Startup costs from $15\/month for 50,000 emails, and Premier from $80\/month for 100,000 emails.<\/p>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>SparkPost Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Strong analytics for high-volume senders<\/li>\n    <li>Competitive price at 50,000 emails ($15)<\/li>\n    <li>Free test plan<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>SparkPost Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Overage per 1,000 emails adds up on small plans<\/li>\n    <li>Interface aimed at technical teams<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> Test free; Startup from <strong>$15\/month<\/strong> (50K); Premier from $80\/month (100K).<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> High-volume senders who need deep analytics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"8-brevo-best-free-daily-allowance\"><span class=\"ez-toc-section\" id=\"8_Brevo_%E2%80%94_Best_Free_Daily_Allowance\"><\/span>8. Brevo \u2014 Best Free Daily Allowance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Brevo includes SMTP relay with its email marketing plans. The free plan sends up to 300 emails a day, about 9,000 a month, and paid plans are priced by monthly emails, starting at $9\/month for 5,000.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s a good fit for small sites that need a free relay for contact forms and order emails, but the daily cap on the free plan can be a problem for bursty traffic.<\/p>\n\n\n\n<div style=\"background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:24px 28px;margin:22px 0;box-shadow:0 2px 8px rgba(0,0,0,0.04);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\">\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#c6f6d5;color:#22543d;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u2705<\/span>Brevo Pros:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Free relay for up to 300 emails a day<\/li>\n    <li>Marketing and transactional email in one account<\/li>\n    <li>SMS and WhatsApp available<\/li>\n  <\/ul>\n  <p style=\"margin:0 0 12px 0;font-size:16px;font-weight:700;color:#1a202c;\"><span style=\"display:inline-block;background:#fed7d7;color:#742a2a;font-size:15px;padding:3px 9px;border-radius:6px;margin-right:8px;\">\u274c<\/span>Brevo Cons:<\/p>\n  <ul style=\"margin:0 0 22px 0;padding-left:22px;color:#2d3748;font-size:14.5px;line-height:1.85;\">\n    <li>Daily cap on the free plan<\/li>\n    <li>Paid pricing rises with every email you send<\/li>\n  <\/ul>\n  <p style=\"margin:0;font-size:15px;color:#2d3748;padding:14px 16px;background:#f0f9ff;border-left:4px solid #2b6cb0;border-radius:6px;\"><span style=\"margin-right:6px;\">\ud83d\udcb0<\/span><strong>Pricing:<\/strong> Free (300\/day); Starter from <strong>$9\/month<\/strong> (5,000 emails).<\/p>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Best for:<\/strong> Small websites that need a free SMTP relay.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"smtp-relay-pricing-at-10000-50000-and-100000-emails\"><span class=\"ez-toc-section\" id=\"SMTP_Relay_Pricing_at_10000_50000_and_100000_Emails\"><\/span>SMTP Relay Pricing at 10,000, 50,000 and 100,000 Emails<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Monthly prices from each provider\u2019s pricing page on October 9, 2026.<\/p>\n\n\n\n<div style=\"max-width:100%;overflow-x:auto;margin:24px 0;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,0.08);\"><table style=\"width:100%;border-collapse:collapse;background:#fff;min-width:750px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;\"><thead><tr style=\"background:linear-gradient(135deg,#1e3a5f 0%,#2b6cb0 100%);\"><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;border-radius:12px 0 0 0;\">Service<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;\">10,000<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;\">50,000<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;\">100,000<\/th><th style=\"padding:14px 16px;text-align:left;font-size:13px;font-weight:600;color:#fff;letter-spacing:0.4px;white-space:nowrap;border-radius:0 12px 0 0;\">Free option<\/th><\/tr><\/thead><tbody><tr style=\"background:linear-gradient(90deg,#ebf8ff 0%,#fff 100%);border-left:4px solid #2b6cb0;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;vertical-align:middle;\">Mailercloud Email API<\/td><td style=\"padding:13px 16px;font-size:13px;color:#276749;font-weight:700;vertical-align:middle;\">$10<\/td><td style=\"padding:13px 16px;font-size:13px;color:#276749;font-weight:700;vertical-align:middle;\">$10<\/td><td style=\"padding:13px 16px;font-size:13px;color:#276749;font-weight:700;vertical-align:middle;\">$100 (500K plan)<\/td><td style=\"padding:13px 16px;font-size:13px;color:#276749;font-weight:700;vertical-align:middle;\">14-day trial<\/td><\/tr><tr style=\"background:#f8fafc;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;vertical-align:middle;\">Amazon SES<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$1<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$5<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$10<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Pay as you go<\/td><\/tr><tr style=\"background:#fff;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;vertical-align:middle;\">Postmark<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$15<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Scales<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Scales<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">100\/month<\/td><\/tr><tr style=\"background:#f8fafc;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;vertical-align:middle;\">Mailgun<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$15<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$35<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$90<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">100\/day<\/td><\/tr><tr style=\"background:#fff;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;vertical-align:middle;\">SendGrid<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$19.95<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$19.95<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$89.95<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">60-day trial<\/td><\/tr><tr style=\"background:#f8fafc;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;vertical-align:middle;\">SparkPost<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">\u2014<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$15<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">$80<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Test plan<\/td><\/tr><tr style=\"background:#fff;border-bottom:1px solid #edf2f7;\"><td style=\"padding:13px 16px;font-size:13.5px;font-weight:700;color:#1a202c;vertical-align:middle;\">SMTP2GO<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">From $15<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Scales<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">Scales<\/td><td style=\"padding:13px 16px;font-size:13px;color:#4a5568;vertical-align:middle;\">1,000\/month<\/td><\/tr><\/tbody><\/table><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">At 50,000 emails a month, only Amazon SES is cheaper than Mailercloud, and SES needs developer time to set up and monitor.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"the-mailercloud-view-get-the-basics-right-before-you-pick-a-relay\"><span class=\"ez-toc-section\" id=\"The_Mailercloud_View_Get_the_Basics_Right_Before_You_Pick_a_Relay\"><\/span>The Mailercloud View: Get the Basics Right Before You Pick a Relay<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most &#8220;my emails go to spam&#8221; problems aren\u2019t caused by the relay. They come from setup. Before your first send:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Authenticate your domain.<\/strong> Publish SPF and DKIM records for the relay, then add a DMARC policy. Gmail, Yahoo and Microsoft now require this for bulk senders. See <a href=\"https:\/\/support.google.com\/a\/answer\/81126\" target=\"_blank\" rel=\"noopener nofollow\">Google\u2019s sender guidelines<\/a>, <a href=\"https:\/\/senders.yahooinc.com\/best-practices\/\" target=\"_blank\" rel=\"noopener nofollow\">Yahoo\u2019s best practices<\/a> and <a href=\"https:\/\/techcommunity.microsoft.com\/blog\/microsoftdefenderforoffice365blog\/strengthening-email-ecosystem-outlook%E2%80%99s-new-requirements-for-high%E2%80%90volume-senders\/4399730\" target=\"_blank\" rel=\"noopener nofollow\">Microsoft\u2019s requirements<\/a>.<\/li>\n\n\n<li><strong>Use TLS on port 587 or 465.<\/strong> Avoid port 25, which many hosts block.<\/li>\n\n\n<li><strong>Separate transactional and marketing mail.<\/strong> Use a different subdomain or stream so a marketing complaint spike can\u2019t delay password resets. Our <a href=\"https:\/\/www.mailercloud.com\/blog\/transactional-email-best-practices\">transactional email best practices<\/a> cover this in more depth.<\/li>\n\n\n<li><strong>Watch bounces.<\/strong> Repeated <a href=\"https:\/\/www.mailercloud.com\/blog\/hard-bounce-vs-soft-bounce\">hard bounces<\/a> hurt your reputation. Our guide to <a href=\"https:\/\/www.mailercloud.com\/blog\/smtp-5-7-x-bounce-codes\">SMTP 5.7.x bounce codes<\/a> explains the common errors.<\/li>\n\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-choose\"><span class=\"ez-toc-section\" id=\"How_to_Choose\"><\/span>How to Choose<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Up to 50,000 emails a month, want simple pricing:<\/strong> Mailercloud ($10).<\/li>\n\n\n<li><strong>Huge volume, developers on AWS:<\/strong> Amazon SES.<\/li>\n\n\n<li><strong>Transactional speed is critical:<\/strong> Postmark.<\/li>\n\n\n<li><strong>Need logs and inbound routing:<\/strong> Mailgun.<\/li>\n\n\n<li><strong>Need the widest SDK support:<\/strong> SendGrid.<\/li>\n\n\n<li><strong>Relaying from printers, CRMs and plugins:<\/strong> SMTP2GO.<\/li>\n\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For a broader comparison, see our list of the <a href=\"https:\/\/www.mailercloud.com\/blog\/best-transactional-email-services\">best transactional email services<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"frequently-asked-questions\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-best-smtp-relay-service\">What is the best SMTP relay service?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Mailercloud Email API is the best SMTP relay for most small businesses and SaaS teams in 2026.<\/strong> It costs $10\/month for 50,000 emails, supports SMTP and API, and includes a 14-day free trial. Amazon SES is cheapest at very high volume.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"is-there-a-free-smtp-relay-service\">Is there a free SMTP relay service?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Yes. Brevo (300 emails a day), SMTP2GO (1,000 a month), Mailgun (100 a day) and Postmark (100 a month) have free plans.<\/strong> Mailercloud and SendGrid offer free trials.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"what-is-the-cheapest-smtp-relay\">What is the cheapest SMTP relay?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Amazon SES at $0.10 per 1,000 emails.<\/strong> For a managed service with support and a simple dashboard, Mailercloud at $10 for 50,000 emails is one of the cheapest.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"whats-the-difference-between-an-smtp-relay-and-an-email-api\">What\u2019s the difference between an SMTP relay and an email API?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Both send email through the provider\u2019s servers.<\/strong> SMTP relay works with any software that supports SMTP, with no code. An API gives developers more control and richer responses. Many providers, including Mailercloud, offer both.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"which-port-should-i-use-for-smtp-relay\">Which port should I use for SMTP relay?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Use port 587 with STARTTLS or port 465 with implicit TLS.<\/strong> Port 25 is often blocked by hosting providers and ISPs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"do-i-need-spf-dkim-and-dmarc-for-an-smtp-relay\">Do I need SPF, DKIM and DMARC for an SMTP relay?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Yes. Without them, Gmail, Yahoo and Microsoft are likely to reject or filter your mail.<\/strong> Every provider here gives you the DNS records to publish.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"final-verdict\"><span class=\"ez-toc-section\" id=\"Final_Verdict\"><\/span>Final Verdict<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The best SMTP relay depends on your volume and your team. <strong>Mailercloud<\/strong> gives you SMTP and API sending for $10\/month for 50,000 emails, with email marketing in the same account. <strong>Amazon SES<\/strong> is cheapest at scale for developer teams, <strong>Postmark<\/strong> is best for fast transactional delivery, and <strong>Mailgun<\/strong> and <strong>SendGrid<\/strong> suit teams that need deep logs or a big ecosystem.<\/p>\n\n\n\n<div style=\"background:#ebf4ff;border-radius:14px;padding:clamp(28px,3.6vw,40px) clamp(20px,3vw,36px);margin:36px 0;text-align:center;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;\">\n  <p style=\"margin:0 0 10px 0;font-size:clamp(20px,2.4vw,27px);line-height:1.25;letter-spacing:-0.015em;font-weight:400;color:#111827;\">Send 50,000 emails for $10 a month &mdash; <strong style=\"font-weight:800;\">try the Mailercloud Email API<\/strong><\/p>\n  <p style=\"margin:0 0 20px 0;font-size:13.5px;color:#4a5568;\"><span style=\"color:#f6ad55;letter-spacing:1px;\">\u2605\u2605\u2605\u2605\u2605<\/span>&nbsp; 4.5\/5 on G2, Capterra &amp; Trustpilot &middot; Trusted by 35,000+ businesses<\/p>\n  <div style=\"display:flex;flex-wrap:wrap;gap:10px;justify-content:center;\">\n    <a href=\"https:\/\/app.mailercloud.com\/register?source=blog&amp;utm_source=blog&amp;utm_medium=organic&amp;utm_campaign=listicle_smtp_relay_services\" style=\"display:inline-block;background:#111827;color:#ffffff;font-size:15px;font-weight:600;text-decoration:none;padding:12px 26px;border-radius:999px;\" onmouseover=\"this.style.background='#2b6cb0'\" onmouseout=\"this.style.background='#111827'\">Start your free trial&nbsp;&nbsp;&rarr;<\/a>\n    <a href=\"https:\/\/www.mailercloud.com\/features\/email-api\/?source=blog&amp;utm_source=blog&amp;utm_medium=organic&amp;utm_campaign=listicle_smtp_relay_services\" style=\"display:inline-block;background:transparent;color:#111827;font-size:15px;font-weight:600;text-decoration:none;padding:11px 24px;border-radius:999px;border:1.5px solid #111827;\">See API pricing<\/a>\n  <\/div>\n  <p style=\"margin:14px 0 0 0;font-size:12.5px;color:#4a5568;\">14-day free trial &middot; SMTP &amp; API &middot; No credit card<\/p>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>Last updated: October 2026 | Pricing checked on October 9, 2026 | 10 min read An SMTP relay service sends email from your website, app or business software through a dedicated, authenticated mail server instead of your own. That matters because emails sent straight from a web server or a shared host often land in [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":6281,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6251","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-marketing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>8 Best SMTP Relay Services in 2026 (Pricing Compared)<\/title>\n<meta name=\"description\" content=\"Compare 8 SMTP relay services on price at 10K, 50K and 100K emails, free plans, setup and deliverability. 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