Transactional Email APIs · reliability comparison
Loops vs MailerSend: which is more reliable? (2026)
MailerSend is more reliable than Loops, scoring 100.0 vs 96.3 out of 100. Over the last 90 days Loops reported 1 incident and MailerSend reported 0, with effective uptime of 99.98% and 100% respectively.
Data updated Nov 2, 2026 · How we score
| Metric | Loops | MailerSend |
|---|---|---|
| Reliability score | 96.3 | 100.0 |
| Rank (transactional email APIs) | #3 | — |
| Uptime (90 days) | 99.98% | 100% |
| Incidents (90 days) | 1 | 0 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 1h 34m | — |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Loops and MailerSend differ
- MailerSend reported no incidents in the last 90 days, while Loops reported 1.
90-day uptime
Loops
MailerSend
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Loops incidents
- Degraded performanceSep 11, 2026 · resolved in 1h 34m
Delay in email metric processing
Affected: App
Recent MailerSend incidents
- MaintenanceSep 23, 2026 · ongoing
Affected: Email sending API, Email analytics, Deliverability rate, MailerSend APP, Bulk endpoint, SMTP +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
- Twilio SendGrid · #4 · 99.98% uptime
- Mailchimp Transactional (Mandrill) · #5 · 99.93% uptime
See the full most reliable transactional email apis ranking →