Transactional email APIs · #5 of 16 · ↑ SendGrid · ↓ Brevo
Mailgun
Mailgun ranks #5 of 16 in transactional email apis in the week of 28 September 2026, with a visibility score of 41 across ChatGPT, Claude, Gemini and Perplexity. It was named in 63% of the answers we sampled.
sampled: 3 of 4 assistants this week
Mailgun scores 41 out of 100 overall in the Transactional email APIs category, with ChatGPT at 45, Claude at 46, and Perplexity at 32. It shows up in 40 of 62 answers tracked. AI assistants bring it up most reliably for broad, foundational questions: it's named in 4 of 4 answers on the best transactional email APIs, 3 of 3 on deliverability, 3 of 3 on developer-friendly email APIs, 3 of 3 on SMTP services for apps, and 3 of 4 on developer experience. One gap: it's never named when the question turns to tools for testing and previewing emails before sending.
this is mine claim it, free, forever. We also check whether ChatGPT and Claude can read mailgun.com.
Who's talking about you
| 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 |
Questions you win
| question | named in | best spot |
|---|---|---|
| What's the best email API for a European company that needs EU data hosting? | 3 of 3 | #1 |
| What's the best email API for developers? | 3 of 3 | #2 |
| What's the best SMTP service for an app? | 3 of 3 | #2 |
| What's the best alternative to SendGrid? | 3 of 3 | #3 |
| Which email API has the best deliverability? | 3 of 3 | #3 |
| What are the best transactional email APIs? | 4 of 4 | #4 |
| Which transactional email provider has the best developer experience? | 3 of 4 | #3 |
| What's the best transactional email provider for high volume at low cost? | 2 of 3 | #3 |
| Which transactional email service is best for a startup? | 2 of 3 | #4 |
| What's the best email API in 2026? | 2 of 3 | #4 |
| What's the best way to send password reset and verification emails from my app? | 2 of 3 | #4 |
| Which email API has the best free tier? | 2 of 3 | #5 |
| What's the best email API with React or JSX email templates? | 2 of 3 | #5 |
| What's the best email API with webhooks for bounces and opens? | 1 of 3 | #3 |
| What's the best email API that also handles marketing campaigns? | 1 of 3 | #4 |
| What's the best open-source or self-hosted transactional email server? | 1 of 3 | #5 |
| What's the best email service for sending receipts and order confirmations? | 1 of 3 | #5 |
| What's the best email API for a Next.js or serverless app? | 1 of 3 | #7 |
| What's the cheapest way to send transactional email at scale? | 1 of 3 | #8 |
Questions you lose
| question | who got named instead |
|---|---|
| What's the best tool to test and preview emails before sending? | nobody in particular |
Assistants cited 10 pages for questions in this category that name your rivals and not you. Claim to see them. See all sources for Transactional email APIs.
In their words
- ChatGPT“| Mailgun | Developer-heavy teams needing mature tooling | Offers EU region processing options | Verify exactly which data categories remain in-region for your plan and setup.”
- Claude“Mailgun (EU region) — My default recommendation for most teams.”
- Gemini“Mailgun: Offers solid APIs and great log retention options, but its pricing structure changes frequently, and the UI is bloated compared to Resend or Postmark.”
Closest rivals
- Mailgun vs SendGrid47
- Mailgun vs Amazon SES59
- Mailgun vs Brevo23
- Mailgun vs Resend61
- Mailgun vs Postmark63
All Mailgun alternatives · Full Transactional email APIs leaderboard · Sources