Amazon SES vs Postmark
as AI assistants see them, week of 2026-09-28
Amazon SES and Postmark are both regulars in AI answers about transactional email, with SES named in 51 of 62 answers and Postmark close behind at 49 of 62. Scores put Postmark slightly ahead overall, 63 to 59, with an edge from Perplexity (65 vs 57) while Claude rates them equal at 64. Both are named in every answer about the best transactional email APIs and developer experience, and both go unmentioned for email testing and preview tools. Head-to-head, each leads in 4 questions, with 12 ties, including deliverability. Postmark picks up extra mentions for webhooks and serverless apps; SES shows up more for high-volume, low-cost sending.
Head to head
| metric | Amazon SES | Postmark |
|---|---|---|
| score | 59 | 63 |
| questions won | 19 | 18 |
By assistant
Amazon SES
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 56 | 75% of answers | #3.3 |
| Claude | 64 | 95% of answers | #4.2 |
| Gemini | not sampled this week | ||
| Perplexity | 57 | 75% of answers | #3.1 |
Postmark
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 62 | 75% of answers | #2.4 |
| Claude | 64 | 85% of answers | #3.2 |
| Gemini | not sampled this week | ||
| Perplexity | 65 | 75% of answers | #2.1 |
Where they differ
Only Amazon SES gets named for
- What's the best email API for a European company that needs EU data hosting?
Only Postmark gets named for
nothing exclusive
More comparisons
- Amazon SES vs Resend
- Amazon SES vs SendGrid
- Amazon SES vs Mailgun
- Amazon SES vs Brevo
- Postmark vs Resend
- Postmark vs SendGrid
Not sold on either?
Scores count how often each assistant names a product, weighted by position. How the score works · Full Transactional email APIs leaderboard