Transactional Email APIs · reliability comparison
Mailgun vs Twilio SendGrid: which is more reliable? (2026)
Twilio SendGrid is more reliable than Mailgun, scoring 94.8 vs 83.2 out of 100. Over the last 90 days Mailgun reported 10 incidents and Twilio SendGrid reported 5, with effective uptime of 99.84% and 99.98% respectively. Twilio SendGrid resolves incidents faster on average (1h 9m).
Data updated Nov 1, 2026 · How we score
| Metric | Mailgun | Twilio SendGrid |
|---|---|---|
| Reliability score | 83.2 | 94.8 |
| Rank (transactional email APIs) | #6 | #4 |
| Uptime (90 days) | 99.84% | 99.98% |
| Incidents (90 days) | 10 | 5 |
| Partial / major outages | 3 | 0 |
| Avg time to resolve | 1h 43m | 1h 9m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailgun and Twilio SendGrid differ
- Mailgun reported 2× as many incidents as Twilio SendGrid over the last 90 days (10 vs 5).
- Mailgun had 3 partial or major outages, compared with 0 for Twilio SendGrid.
- Twilio SendGrid fixes problems faster: 1h 9m on average, against 1h 43m for Mailgun.
- Mailgun's longest outage on record lasted 3h 37m (May 25, 2026); Twilio SendGrid's lasted 2h 2m (Jul 8, 2026).
90-day uptime
Mailgun
Twilio SendGrid
- 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 Twilio SendGrid incidents
- MaintenanceOct 29, 2026 · resolved in 1h 26m
[Scheduled] Sendgrid Maintenance Impacting Delivery and Account Configuration
- Degraded performanceOct 24, 2026 · resolved in 50m
Azure Marketplace SendGrid Customers Experiencing Account Management Issues
- InformationalOct 15, 2026 · resolved in <1m
- InformationalOct 2, 2026 · resolved in <1m
- MaintenanceSep 4, 2026 · resolved in 7h 16m
Multiple delivery failures when sending emails to Microsoft or MS based recipients
- MaintenanceAug 24, 2026 · resolved in 22d
Other transactional email APIs to consider
- Mailjet · #1 · 100% uptime
- Mailtrap Email Sending · #2 · 99.99% uptime
- Loops · #3 · 99.98% uptime
- SparkPost (Bird) · #5 · 99.90% uptime
See the full most reliable transactional email apis ranking →