Transactional Email APIs · reliability comparison
MailerSend vs Mailjet: which is more reliable? (2026)
MailerSend and Mailjet are effectively tied on reliability (100.0 vs 99.6). Over the last 90 days MailerSend reported 0 incidents and Mailjet reported 1, with effective uptime of 100% and 100% respectively.
Data updated Nov 2, 2026 · How we score
| Metric | MailerSend | Mailjet |
|---|---|---|
| Reliability score | 100.0 | 99.6 |
| Rank (transactional email APIs) | — | #1 |
| Uptime (90 days) | 100% | 100% |
| Incidents (90 days) | 0 | 1 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | — | — |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where MailerSend and Mailjet differ
- MailerSend reported no incidents in the last 90 days, while Mailjet reported 1.
90-day uptime
MailerSend
Mailjet
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent MailerSend incidents
- MaintenanceSep 23, 2026 · ongoing
Affected: Delivery time, Email sending API, Email analytics, Deliverability rate, MailerSend APP, Bulk endpoint +2 more
- MaintenanceSep 15, 2026 · ongoing
Scheduled maintenance - Email sending affected, 5 min
Affected: Bulk endpoint, SMTP, Delivery time, Email sending API, Inbound routing
Recent Mailjet incidents
- InformationalSep 4, 2026 · resolved in 32m
Other transactional email APIs to consider
- Mailtrap Email Sending · #2 · 99.99% uptime
- Loops · #3 · 99.98% uptime
- Twilio SendGrid · #4 · 99.98% uptime
- Mailchimp Transactional (Mandrill) · #5 · 99.93% uptime
See the full most reliable transactional email apis ranking →