Transactional Email APIs · reliability comparison
Brevo vs Mailchimp Transactional (Mandrill): which is more reliable? (2026)
Mailchimp Transactional (Mandrill) is more reliable than Brevo, scoring 90.6 vs 70.5 out of 100. Over the last 90 days Brevo reported 29 incidents and Mailchimp Transactional (Mandrill) reported 3, with effective uptime of 99.68% and 99.93% respectively. Brevo resolves incidents faster on average (1h 24m).
Data updated Nov 2, 2026 · How we score
| Metric | Brevo | Mailchimp Transactional (Mandrill) |
|---|---|---|
| Reliability score | 70.5 | 90.6 |
| Rank (transactional email APIs) | #9 | #5 |
| Uptime (90 days) | 99.68% | 99.93% |
| Incidents (90 days) | 29 | 3 |
| Partial / major outages | 5 | 0 |
| Avg time to resolve | 1h 24m | 3h 4m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Brevo and Mailchimp Transactional (Mandrill) differ
- Brevo reported 9.7× as many incidents as Mailchimp Transactional (Mandrill) over the last 90 days (29 vs 3).
- Brevo had 5 partial or major outages, compared with 0 for Mailchimp Transactional (Mandrill).
- Brevo fixes problems faster: 1h 24m on average, against 3h 4m for Mailchimp Transactional (Mandrill) (2.2× quicker).
- Brevo's longest outage on record lasted 2h 2m (Oct 1, 2026); Mailchimp Transactional (Mandrill)'s lasted 4h 26m (Sep 15, 2026).
90-day uptime
Brevo
Mailchimp Transactional (Mandrill)
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Brevo incidents
- Degraded performanceOct 27, 2026 · resolved in 4h 21m
Affected: SMS Campaigns, Transactional emails delivery, Outbound Webhooks, Workflows, Meetings, Marketing email tracking links +4 more
- Degraded performanceOct 26, 2026 · resolved in 2h 11m
Error with doubleOptinConfirmation API
Affected: Contact Management API
- InformationalOct 22, 2026 · resolved in 1h 55m
- Degraded performanceOct 19, 2026 · resolved in 20m
Affected: Account and Settings API
- Degraded performanceOct 15, 2026 · resolved in 10m
Affected: Transactional emails delivery, Brevo Tracker, Workflows, Transactional emails tracking links
- Degraded performanceOct 15, 2026 · resolved in 12m
Delay in Processing Loyalty API request
Affected: Loyalty API
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
- Mailtrap Email Sending · #2 · 99.99% uptime
- Loops · #3 · 99.98% uptime
- Twilio SendGrid · #4 · 99.98% uptime
See the full most reliable transactional email apis ranking →