Transactional Email APIs · reliability comparison
Mailjet vs Postmark: which is more reliable? (2026)
Mailjet is more reliable than Postmark, scoring 99.6 vs 68.3 out of 100. Over the last 90 days Mailjet reported 1 incident and Postmark reported 8, with effective uptime of 100% and 99.58% respectively.
Data updated Nov 1, 2026 · How we score
| Metric | Mailjet | Postmark |
|---|---|---|
| Reliability score | 99.6 | 68.3 |
| Rank (transactional email APIs) | #1 | #9 |
| Uptime (90 days) | 100% | 99.58% |
| Incidents (90 days) | 1 | 8 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | — | 7h 41m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailjet and Postmark differ
- Postmark reported 8× as many incidents as Mailjet over the last 90 days (8 vs 1).
- Mailjet's longest outage on record lasted 32m (Jun 5, 2026); Postmark's lasted 1d 3h (Feb 1, 2026).
90-day uptime
Mailjet
Postmark
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Mailjet incidents
- InformationalSep 4, 2026 · resolved in 32m
Recent Postmark incidents
- Degraded performanceOct 27, 2026 · resolved in 1h 43m
- MaintenanceOct 7, 2026 · resolved in 3h
- Degraded performanceSep 28, 2026 · resolved in 2h 6m
- Degraded performanceSep 28, 2026 · resolved in 3h 59m
- Degraded performanceSep 22, 2026 · resolved in 20m
- Degraded performanceSep 17, 2026 · resolved in 1h 33m
Other transactional email APIs to consider
- Mailtrap Email Sending · #2 · 99.99% uptime
- Loops · #3 · 99.98% uptime
- Twilio SendGrid · #4 · 99.98% uptime
- SparkPost (Bird) · #5 · 99.90% uptime
See the full most reliable transactional email apis ranking →