Postmark vs Resend: which one does AI recommend?

We asked ChatGPT, Gemini and Perplexity 10 questions buyers ask about transactional email API — 30 answers in total — and counted who got named. Postmark is named in 22 of 30 answers (73%); Resend in 19 (63%).

Postmark

73%

named in 22 of 30 answers

Resend

63%

named in 19 of 30 answers

How they rank against everyone else

Postmark

73%

Amazon SES

67%

Resend

63%

SendGrid

60%

Mailgun

50%

Brevo

33%

Mailtrap Email Sending

27%

MailerSend

20%

Where does your product land?

Same 10 questions, your product, about a minute. No account.

Counts are mentions in AI answers, not endorsements, measured 2026-09-20. Nobody pays to appear.