Transactional Email APIs · reliability comparison
Postmark vs Twilio SendGrid: which is more reliable? (2026)
Twilio SendGrid is more reliable than Postmark, scoring 94.8 vs 68.3 out of 100. Over the last 90 days Postmark reported 8 incidents and Twilio SendGrid reported 5, with effective uptime of 99.58% and 99.98% respectively. Twilio SendGrid resolves incidents faster on average (1h 9m).
Data updated Nov 1, 2026 · How we score
VS
| Metric | Postmark | Twilio SendGrid |
|---|---|---|
| Reliability score | 68.3 | 94.8 |
| Rank (transactional email APIs) | #10 | #4 |
| Uptime (90 days) | 99.58% | 99.98% |
| Incidents (90 days) | 8 | 5 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 7h 41m | 1h 9m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Postmark and Twilio SendGrid differ
- Postmark reported 60% more incidents than Twilio SendGrid over the last 90 days (8 vs 5).
- Twilio SendGrid fixes problems faster: 1h 9m on average, against 7h 41m for Postmark (6.7× quicker).
- Postmark's longest outage on record lasted 1d 3h (Feb 1, 2026); Twilio SendGrid's lasted 2h 2m (Jul 8, 2026).
90-day uptime
Postmark
Twilio SendGrid
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
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
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
- Mailchimp Transactional (Mandrill) · #5 · 99.93% uptime
See the full most reliable transactional email apis ranking →