category
Transactional email APIs, as AI assistants see them
In the week of 28 September 2026, the AI assistants we track most often recommend Postmark (63), Resend (61) and Amazon SES (59) for transactional email apis, out of 16 products we follow in this category. Scores are the share of 60 answers naming each product, across 3 assistants.
Postmark tops the Transactional email APIs leaderboard with an overall score of 63, just edging out Resend at 61 — a gap of only 2 points. Amazon SES isn't far behind at 59, making the top three a tight race, even though SES actually leads on raw mentions, showing up in 51 of 62 answers versus Postmark's 49 and Resend's 46. Resend swings wildly by assistant, from a strong 76 with ChatGPT down to 39 with Perplexity. Further back, SendGrid (47) and Mailgun (41) round out the top 5, out of 16 products tracked overall.
Updated 2026-09-28. We re-ask every assistant on a schedule and publish whatever they say.
sampled: 3 of 4 assistants this week
Leaderboard
| # | product | score | vs last week |
|---|---|---|---|
| 1 | Postmark | 63 | new |
| 2 | Resend | 61 | new |
| 3 | Amazon SES | 59 | new |
| 4 | SendGrid | 47 | new |
| 5 | Mailgun | 41 | new |
| 6 | Brevo | 23 | new |
| 7 | Mailtrap | 13 | new |
| 8 | MailerSend | 10 | new |
| 9 | Mailjet | 9 | new |
| 10 | Postal | 7 | new |
| 11 | Elastic Email | 5 | new |
| 12 | Loops | 4 | new |
| 13 | Scaleway TEM | 3 | new |
| 14 | Courier | 2 | new |
| 15 | SparkPost | 2 | new |
| 16 | Plunk | 1 | new |
Where the assistants get their answers →
Free guide: how to get recommended in transactional email apis
Built from this week's run — who wins now, the exact questions we ask, the pages the assistants cite, and six steps in order.
Popular head-to-heads
- Postmark vs Resend
- Amazon SES vs Postmark
- Amazon SES vs Resend
- Mailgun vs SendGrid
- Amazon SES vs SendGrid
- Amazon SES vs Mailgun
- Brevo vs Mailtrap
- Brevo vs MailerSend
Looking for alternatives?
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Score = how often an assistant names the product, weighted by position. Full explanation.