Mailgun vs Postmark
as AI assistants see them, week of 2026-09-28
Postmark edges out Mailgun in how AI assistants talk about transactional email. Postmark scores 63 overall (62 ChatGPT, 64 Claude, 65 Perplexity) and gets named in 49 of 62 answers, versus Mailgun's 41 overall (45 ChatGPT, 46 Claude, 32 Perplexity) and 40 of 62 answers. Head-to-head, Postmark comes out ahead on 10 questions, Mailgun on 2, with 8 ties. Both are named in all 4 answers for "best transactional email APIs," and both are never named for email preview/testing tools. Postmark also misses out entirely on the EU data hosting question.
Head to head
| metric | Mailgun | Postmark |
|---|---|---|
| score | 41 | 63 |
| questions won | 19 | 18 |
By assistant
Mailgun
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 45 | 65% of answers | #3.9 |
| Claude | 46 | 80% of answers | #6.0 |
| Gemini | not sampled this week | ||
| Perplexity | 32 | 45% of answers | #3.7 |
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 Mailgun 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
- Mailgun vs SendGrid
- Amazon SES vs Mailgun
- Brevo vs Mailgun
- Mailgun vs Resend
- Postmark vs Resend
- Amazon SES vs Postmark
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