Mailgun vs Resend
as AI assistants see them, week of 2026-09-28
Resend edges out Mailgun in how AI assistants talk about transactional email. Resend scores 61 overall (76 ChatGPT, 69 Claude, 39 Perplexity) and gets named in 46 of 62 answers, versus Mailgun's 41 overall (45 ChatGPT, 46 Claude, 32 Perplexity) and 40 of 62 answers. Head-to-head, Resend is named more often on 9 questions, Mailgun on 5, with 6 ties. Both show up fully for "best transactional email APIs," and Resend sweeps "best developer experience" at 4 of 4. Neither is ever named for email preview/testing tools, and Resend is also never named for self-hosted email servers.
Head to head
| metric | Mailgun | Resend |
|---|---|---|
| score | 41 | 61 |
| 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 |
Resend
| assistant | score | named in, this week | usual spot, this week |
|---|---|---|---|
| ChatGPT | 76 | 85% of answers | #1.8 |
| Claude | 69 | 90% of answers | #3.1 |
| Gemini | not sampled this week | ||
| Perplexity | 39 | 45% of answers | #2.1 |
Where they differ
Only Mailgun gets named for
- What's the best open-source or self-hosted transactional email server?
Only Resend gets named for
nothing exclusive
More comparisons
- Mailgun vs SendGrid
- Amazon SES vs Mailgun
- Brevo vs Mailgun
- Mailgun vs Postmark
- Amazon SES vs Resend
- Postmark vs Resend
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