Transactional Email APIs · reliability comparison
Mailtrap Email Sending vs Postmark: which is more reliable? (2026)
Mailtrap Email Sending is more reliable than Postmark, scoring 98.2 vs 68.3 out of 100. Over the last 90 days Mailtrap Email Sending reported 2 incidents and Postmark reported 8, with effective uptime of 99.99% and 99.58% respectively. Mailtrap Email Sending resolves incidents faster on average (6m).
Data updated Nov 1, 2026 · How we score
VS
| Metric | Mailtrap Email Sending | Postmark |
|---|---|---|
| Reliability score | 98.2 | 68.3 |
| Rank (transactional email APIs) | #2 | #10 |
| Uptime (90 days) | 99.99% | 99.58% |
| Incidents (90 days) | 2 | 8 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 6m | 7h 41m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailtrap Email Sending and Postmark differ
- Postmark reported 4× as many incidents as Mailtrap Email Sending over the last 90 days (8 vs 2).
- Mailtrap Email Sending fixes problems faster: 6m on average, against 7h 41m for Postmark (78.2× quicker).
- Mailtrap Email Sending's longest incident on record lasted 2h 57m (Nov 18, 2025); Postmark's lasted 1d 3h (Feb 1, 2026).
90-day uptime
Mailtrap Email Sending
Postmark
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Mailtrap Email Sending incidents
- MaintenanceOct 8, 2026 · resolved in 38m
- Degraded performanceSep 16, 2026 · resolved in 6m
- Degraded performanceSep 16, 2026 · resolved in 6m
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
- Mailjet · #1 · 100% uptime
- Loops · #3 · 99.98% uptime
- Twilio SendGrid · #4 · 99.98% uptime
- Mailchimp Transactional (Mandrill) · #5 · 99.93% uptime
See the full most reliable transactional email apis ranking →