SMTP Relay Services head-to-head

Compare any two SMTP relay services

First tool #1 Amazon SES · 8.7 #2 Postmark · 8.2 #3 Mailjet · 7.7 #4 SocketLabs · 7.4 #5 AhaSend · 7.1 #6 Brevo Transactional Email · 7.0 #7 Maileroo · 6.7 #8 Mailgun · 6.6 #9 Mailtrap Email Sending · 6.5 #10 SendLayer · 6.5 #11 UniOne · 6.4 #12 MailerSend · 6.3 #13 SMTP2GO · 6.0 #14 Netcore Email API · 6.0 #15 SMTPProvider · 6.0 #16 PowerMTA · 5.9 #17 MailChannels Outbound · 5.8 #18 Doppler Transactional · 5.6 #19 ZeptoMail · 5.5 #20 Resend Broadcasts · 5.5 #21 Mailazy · 5.4 #22 Elastic Email · 5.3 #23 SendPulse · 5.3 #24 MailPace · 5.2 #25 AuthSMTP · 5.2 #26 Mailchimp · 5.2 #27 Azure Communication Services SMS · 5.2 vs Second tool #1 Amazon SES · 8.7 #2 Postmark · 8.2 #3 Mailjet · 7.7 #4 SocketLabs · 7.4 #5 AhaSend · 7.1 #6 Brevo Transactional Email · 7.0 #7 Maileroo · 6.7 #8 Mailgun · 6.6 #9 Mailtrap Email Sending · 6.5 #10 SendLayer · 6.5 #11 UniOne · 6.4 #12 MailerSend · 6.3 #13 SMTP2GO · 6.0 #14 Netcore Email API · 6.0 #15 SMTPProvider · 6.0 #16 PowerMTA · 5.9 #17 MailChannels Outbound · 5.8 #18 Doppler Transactional · 5.6 #19 ZeptoMail · 5.5 #20 Resend Broadcasts · 5.5 #21 Mailazy · 5.4 #22 Elastic Email · 5.3 #23 SendPulse · 5.3 #24 MailPace · 5.2 #25 AuthSMTP · 5.2 #26 Mailchimp · 5.2 #27 Azure Communication Services SMS · 5.2 Compare

Every tool in the ranking is in the list, #1 to #27.

Top matchups The top four, head-to-head

• Postmark#2 · 8.2 vs Mailjet#3 · 7.7 1 win1 even0 wins Postmark leads on 1 of 2 checks, Mailjet on 0, and 1 are even. Monthly send limit: 10000 emails/mo on Postmark vs 8000 emails/mo Postmark vs Mailjet →
• Amazon SES#1 · 8.7 vs SocketLabs#4 · 7.4 0 wins1 even0 wins Amazon SES leads on 0 of 1 checks, SocketLabs on 0, and 1 are even. Amazon SES vs SocketLabs →
• Postmark#2 · 8.2 vs SocketLabs#4 · 7.4 2 wins0 even1 win Postmark leads on 2 of 3 checks, SocketLabs on 1, and 0 are even. Postmark costs less: $15/mo vs $39.95/moFree plan only on Postmark Postmark vs SocketLabs →
• Mailjet#3 · 7.7 vs SocketLabs#4 · 7.4 1 win0 even1 win Mailjet leads on 1 of 2 checks, SocketLabs on 1, and 0 are even. Free plan only on MailjetMonthly send limit: 40000 emails/mo on SocketLabs vs 8000 emails/mo Mailjet vs SocketLabs →

Every top-8 matchup 19 comparisons, grouped by tool

• Amazon SES#1 · 8.7
  • vsAmazon SES vs SocketLabs7.4
  • vsAmazon SES vs AhaSend7.1
  • vsAmazon SES vs Maileroo6.7
• Postmark#2 · 8.2
  • vsPostmark vs Mailjet7.7
  • vsPostmark vs SocketLabs7.4
  • vsPostmark vs AhaSend7.1
  • vsPostmark vs Maileroo6.7
• Mailjet#3 · 7.7
  • vsMailjet vs Postmark8.2
  • vsMailjet vs SocketLabs7.4
  • vsMailjet vs AhaSend7.1
  • vsMailjet vs Maileroo6.7
• SocketLabs#4 · 7.4
  • vsSocketLabs vs Amazon SES8.7
  • vsSocketLabs vs Postmark8.2
  • vsSocketLabs vs Mailjet7.7
  • vsSocketLabs vs AhaSend7.1
  • vsSocketLabs vs Brevo Transactional Email7.0
  • vsSocketLabs vs Maileroo6.7
  • vsSocketLabs vs Mailgun6.6
• AhaSend#5 · 7.1
  • vsAhaSend vs Amazon SES8.7
  • vsAhaSend vs Postmark8.2
  • vsAhaSend vs Mailjet7.7
  • vsAhaSend vs SocketLabs7.4
  • vsAhaSend vs Brevo Transactional Email7.0
  • vsAhaSend vs Maileroo6.7
  • vsAhaSend vs Mailgun6.6
• Brevo Transactional Email#6 · 7.0
  • vsBrevo Transactional Email vs SocketLabs7.4
  • vsBrevo Transactional Email vs AhaSend7.1
  • vsBrevo Transactional Email vs Maileroo6.7
• Maileroo#7 · 6.7
  • vsMaileroo vs Amazon SES8.7
  • vsMaileroo vs Postmark8.2
  • vsMaileroo vs Mailjet7.7
  • vsMaileroo vs SocketLabs7.4
  • vsMaileroo vs AhaSend7.1
  • vsMaileroo vs Brevo Transactional Email7.0
  • vsMaileroo vs Mailgun6.6
• Mailgun#8 · 6.6
  • vsMailgun vs SocketLabs7.4
  • vsMailgun vs AhaSend7.1
  • vsMailgun vs Maileroo6.7

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Compiled by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated 28 Sep 2026 · How we research and update