Transactional Email APIs · reliability comparison
Mailchimp Transactional (Mandrill) vs Twilio SendGrid: which is more reliable? (2026)
Twilio SendGrid is more reliable than Mailchimp Transactional (Mandrill), scoring 94.8 vs 90.6 out of 100. Over the last 90 days Mailchimp Transactional (Mandrill) reported 3 incidents and Twilio SendGrid reported 5, with effective uptime of 99.93% and 99.98% respectively. Twilio SendGrid resolves incidents faster on average (1h 9m).
Data updated Nov 1, 2026 · How we score
| Metric | Mailchimp Transactional (Mandrill) | Twilio SendGrid |
|---|---|---|
| Reliability score | 90.6 | 94.8 |
| Rank (transactional email APIs) | #5 | #4 |
| Uptime (90 days) | 99.93% | 99.98% |
| Incidents (90 days) | 3 | 5 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 3h 4m | 1h 9m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailchimp Transactional (Mandrill) and Twilio SendGrid differ
- Twilio SendGrid reported 67% more incidents than Mailchimp Transactional (Mandrill) over the last 90 days (5 vs 3).
- Twilio SendGrid fixes problems faster: 1h 9m on average, against 3h 4m for Mailchimp Transactional (Mandrill) (2.7× quicker).
- Mailchimp Transactional (Mandrill)'s longest incident on record lasted 4h 26m (Sep 15, 2026); Twilio SendGrid's lasted 2h 2m (Jul 8, 2026).
90-day uptime
Mailchimp Transactional (Mandrill)
Twilio SendGrid
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Mailchimp Transactional (Mandrill) incidents
- Degraded performanceSep 17, 2026 · resolved in 38m
Delayed Deliveries via Mandrill
Affected: Delayed Deliveries via Mandrill
- Degraded performanceSep 15, 2026 · resolved in 4h 26m
Delayed Deliveries via Mandrill
Affected: Delayed Deliveries via Mandrill
- Degraded performanceSep 1, 2026 · resolved in 4h 8m
Affected: Mandrill/Transactional Delays
Full Mailchimp Transactional (Mandrill) reliability report →
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) · #6 · 99.90% uptime
See the full most reliable transactional email apis ranking →