Transactional Email APIs · reliability comparison
Amazon SES vs MailerSend: which is more reliable? (2026)
Amazon SES and MailerSend are effectively tied on reliability (100.0 vs 100.0). Over the last 90 days Amazon SES reported 0 incidents and MailerSend reported 0, with effective uptime of 100% and 100% respectively.
Data updated Nov 2, 2026 · How we score
| Metric | Amazon SES | MailerSend |
|---|---|---|
| Reliability score | 100.0 | 100.0 |
| Rank (transactional email APIs) | — | — |
| Uptime (90 days) | 100% | 100% |
| Incidents (90 days) | 0 | 0 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | — | — |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
90-day uptime
Amazon SES
MailerSend
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Amazon SES incidents
No incidents reported by Amazon SES in the last 90 days.
Recent MailerSend incidents
- MaintenanceSep 23, 2026 · ongoing
Affected: SMTP, Email activity, Delivery time, Email sending API, Email analytics, Deliverability rate +2 more
- MaintenanceSep 15, 2026 · ongoing
Scheduled maintenance - Email sending affected, 5 min
Affected: Bulk endpoint, SMTP, Delivery time, Email sending API, Inbound routing
Other transactional email APIs to consider
- Mailjet · #1 · 100% uptime
- Mailtrap Email Sending · #2 · 99.99% uptime
- Loops · #3 · 99.98% uptime
- Twilio SendGrid · #4 · 99.98% uptime
See the full most reliable transactional email apis ranking →