Transactional Email APIs · reliability comparison
Mailjet vs Mailchimp Transactional (Mandrill): which is more reliable? (2026)
Mailjet is more reliable than Mailchimp Transactional (Mandrill), scoring 99.6 vs 90.6 out of 100. Over the last 90 days Mailjet reported 1 incident and Mailchimp Transactional (Mandrill) reported 3, with effective uptime of 100% and 99.93% respectively.
Data updated Nov 1, 2026 · How we score
VS
| Metric | Mailjet | Mailchimp Transactional (Mandrill) |
|---|---|---|
| Reliability score | 99.6 | 90.6 |
| Rank (transactional email APIs) | #1 | #5 |
| Uptime (90 days) | 100% | 99.93% |
| Incidents (90 days) | 1 | 3 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | — | 3h 4m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailjet and Mailchimp Transactional (Mandrill) differ
- Mailchimp Transactional (Mandrill) reported 3× as many incidents as Mailjet over the last 90 days (3 vs 1).
- Mailjet's longest outage on record lasted 32m (Jun 5, 2026); Mailchimp Transactional (Mandrill)'s lasted 4h 26m (Sep 15, 2026).
90-day uptime
Mailjet
Mailchimp Transactional (Mandrill)
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Mailjet incidents
- InformationalSep 4, 2026 · resolved in 32m
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
- Mailtrap Email Sending · #2 · 99.99% 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 →