Transactional Email APIs · reliability comparison
Mailtrap Email Sending vs Mailchimp Transactional (Mandrill): which is more reliable? (2026)
Mailtrap Email Sending is more reliable than Mailchimp Transactional (Mandrill), scoring 98.2 vs 90.6 out of 100. Over the last 90 days Mailtrap Email Sending reported 2 incidents and Mailchimp Transactional (Mandrill) reported 3, with effective uptime of 99.99% and 99.93% respectively. Mailtrap Email Sending resolves incidents faster on average (6m).
Data updated Nov 1, 2026 · How we score
VS
| Metric | Mailtrap Email Sending | Mailchimp Transactional (Mandrill) |
|---|---|---|
| Reliability score | 98.2 | 90.6 |
| Rank (transactional email APIs) | #2 | #5 |
| Uptime (90 days) | 99.99% | 99.93% |
| Incidents (90 days) | 2 | 3 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 6m | 3h 4m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailtrap Email Sending and Mailchimp Transactional (Mandrill) differ
- Mailchimp Transactional (Mandrill) reported 50% more incidents than Mailtrap Email Sending over the last 90 days (3 vs 2).
- Mailtrap Email Sending fixes problems faster: 6m on average, against 3h 4m for Mailchimp Transactional (Mandrill) (31.2× quicker).
- Mailtrap Email Sending's longest incident on record lasted 2h 57m (Nov 18, 2025); Mailchimp Transactional (Mandrill)'s lasted 4h 26m (Sep 15, 2026).
90-day uptime
Mailtrap Email Sending
Mailchimp Transactional (Mandrill)
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Mailtrap Email Sending incidents
- MaintenanceOct 8, 2026 · resolved in 38m
- Degraded performanceSep 16, 2026 · resolved in 6m
- Degraded performanceSep 16, 2026 · resolved in 6m
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 →
Other transactional email APIs to consider
- Mailjet · #1 · 100% uptime
- Loops · #3 · 99.98% uptime
- Twilio SendGrid · #4 · 99.98% uptime
- SparkPost (Bird) · #6 · 99.90% uptime
See the full most reliable transactional email apis ranking →