AI ranking change · 2026-06-30
Postmark overtakes Resend as ChatGPT's #1 pick
for transactional email api
Resend→Postmark
On 2026-06-30, ChatGPT changed its #1 recommendation for best transactional email api — dropping Resend from the top spot in favor of Postmark. The previous #1 had held since 2026-06-30.
“Best pure transactional focus, excellent deliverability reputation, fast time-to-inbox, clean API/SMTP, strong message history and debugging, low-noise product scope”— ChatGPT
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