Transactional Email APIs · reliability comparison
Brevo vs MailerSend: which is more reliable? (2026)
MailerSend is more reliable than Brevo, scoring 100.0 vs 70.5 out of 100. Over the last 90 days Brevo reported 29 incidents and MailerSend reported 0, with effective uptime of 99.68% and 100% respectively.
Data updated Nov 2, 2026 · How we score
| Metric | Brevo | MailerSend |
|---|---|---|
| Reliability score | 70.5 | 100.0 |
| Rank (transactional email APIs) | #9 | — |
| Uptime (90 days) | 99.68% | 100% |
| Incidents (90 days) | 29 | 0 |
| Partial / major outages | 5 | 0 |
| Avg time to resolve | 1h 24m | — |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Brevo and MailerSend differ
- MailerSend reported no incidents in the last 90 days, while Brevo reported 29.
- Brevo had 5 partial or major outages, compared with 0 for MailerSend.
90-day uptime
Brevo
MailerSend
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Brevo incidents
- Degraded performanceOct 27, 2026 · resolved in 4h 21m
Affected: Transactional emails delivery, Workflows, WhatsApp Campaigns, Transactional emails tracking links, SMS Campaigns, Outbound Webhooks +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 MailerSend incidents
- MaintenanceSep 23, 2026 · ongoing
Affected: SMTP, Email activity, Delivery time, Email sending API, Email analytics, Deliverability rate +2 more
- MaintenanceSep 15, 2026 · ongoing
Scheduled maintenance - Email sending affected, 5 min
Affected: Bulk endpoint, SMTP, Delivery time, Email sending API, Inbound routing
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 →