Transactional Email APIs · reliability comparison
MailerSend vs Mailtrap Email Sending: which is more reliable? (2026)
MailerSend and Mailtrap Email Sending are effectively tied on reliability (100.0 vs 98.2). Over the last 90 days MailerSend reported 0 incidents and Mailtrap Email Sending reported 2, with effective uptime of 100% and 99.99% respectively.
Data updated Nov 1, 2026 · How we score
VS
| Metric | MailerSend | Mailtrap Email Sending |
|---|---|---|
| Reliability score | 100.0 | 98.2 |
| Rank (transactional email APIs) | — | #2 |
| Uptime (90 days) | 100% | 99.99% |
| Incidents (90 days) | 0 | 2 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | — | 6m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where MailerSend and Mailtrap Email Sending differ
- MailerSend reported no incidents in the last 90 days, while Mailtrap Email Sending reported 2.
90-day uptime
MailerSend
Mailtrap Email Sending
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent MailerSend incidents
- MaintenanceSep 23, 2026 · ongoing
Affected: Bulk endpoint, SMTP, Email activity, Delivery time, Email sending API, Email analytics +2 more
- MaintenanceSep 15, 2026 · ongoing
Scheduled maintenance - Email sending affected, 5 min
Affected: SMTP, Delivery time, Email sending API, Inbound routing, Bulk endpoint
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
Other transactional email APIs to consider
- Mailjet · #1 · 100% 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 →