Transactional Email APIs · reliability comparison
Mailgun vs Resend: which is more reliable? (2026)
Mailgun is more reliable than Resend, scoring 83.2 vs 60.5 out of 100. Over the last 90 days Mailgun reported 10 incidents and Resend reported 23, with effective uptime of 99.84% and 99.39% respectively. Mailgun resolves incidents faster on average (1h 43m).
Data updated Nov 2, 2026 · How we score
| Metric | Mailgun | Resend |
|---|---|---|
| Reliability score | 83.2 | 60.5 |
| Rank (transactional email APIs) | #7 | #11 |
| Uptime (90 days) | 99.84% | 99.39% |
| Incidents (90 days) | 10 | 23 |
| Partial / major outages | 3 | 4 |
| Avg time to resolve | 1h 43m | 3h 39m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailgun and Resend differ
- Resend reported 2.3× as many incidents as Mailgun over the last 90 days (23 vs 10).
- Resend had 4 partial or major outages, compared with 3 for Mailgun.
- Mailgun fixes problems faster: 1h 43m on average, against 3h 39m for Resend (2.1× quicker).
- Mailgun's longest outage on record lasted 3h 37m (May 25, 2026); Resend's lasted 2h 39m (Aug 8, 2026).
90-day uptime
Mailgun
Resend
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Mailgun incidents
- Degraded performanceOct 28, 2026 · resolved in 1h 4m
Affected: Inbound email processing
- Degraded performanceSep 30, 2026 · resolved in 42m
Affected: Inbound email processing
- Degraded performanceSep 14, 2026 · resolved in 58m
Affected: Inbound email processing
- Major outageSep 4, 2026 · resolved in 17m
Affected: API, SMTP, Outbound Delivery, Inbound email processing, Events & Logs, Stats and Analytics
- InformationalSep 4, 2026 · resolved in 34m
- Degraded performanceAug 31, 2026 · resolved in 7h 14m
Affected: Events & Logs
Recent Resend incidents
- Degraded performanceOct 26, 2026 · resolved in 23m
Affected: Email Events
- Degraded performanceOct 23, 2026 · resolved in 49m
Intermittent latency spikes on our emails API
Affected: Single Email, Broadcast Emails, Batch Emails, Scheduled Emails
- Degraded performanceOct 10, 2026 · resolved in 1h 9m
Delayed new team provisioning and contact webhook delivery
Affected: Dashboard, General API, Webhooks
- Degraded performanceOct 9, 2026 · resolved in 23m
Delayed new team provisioning and contact webhook delivery
Affected: Dashboard, General API, Webhooks
- Degraded performanceOct 1, 2026 · resolved in 52m
- Degraded performanceSep 26, 2026 · resolved in 2h 46m
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 →