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Best transactional email API

3 models · updated 2026-06-29

The verdict

Resend leads — All 3 models rank Resend the top startup.

Combined ranking

  1. 1
    Resend—15 pts
    GPT #1Claude #1Gemini #1· Best developer experience with modern APIs.

Not ranked (incumbents): Postmark, Amazon SES, Mailgun, SendGrid, Twilio SendGrid

By model

ChatGPT

  1. 1.Resend
  2. 2.Postmark
  3. 3.Amazon SES
  4. 4.Mailgun
  5. 5.Twilio SendGrid

Claude

  1. 1.Resend
  2. 2.Amazon SES
  3. 3.Postmark
  4. 4.SendGrid
  5. 5.Mailgun

Gemini

  1. 1.Resend
  2. 2.Postmark
  3. 3.Amazon SES
  4. 4.Mailgun
  5. 5.SendGrid

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously