Transactional Email APIs · reliability comparison
MailerSend vs Twilio SendGrid: which is more reliable? (2026)
MailerSend is more reliable than Twilio SendGrid, scoring 100.0 vs 94.8 out of 100. Over the last 90 days MailerSend reported 0 incidents and Twilio SendGrid reported 5, with effective uptime of 100% and 99.98% respectively.
Data updated Nov 2, 2026 · How we score
| Metric | MailerSend | Twilio SendGrid |
|---|---|---|
| Reliability score | 100.0 | 94.8 |
| Rank (transactional email APIs) | — | #4 |
| Uptime (90 days) | 100% | 99.98% |
| Incidents (90 days) | 0 | 5 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | — | 1h 9m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where MailerSend and Twilio SendGrid differ
- MailerSend reported no incidents in the last 90 days, while Twilio SendGrid reported 5.
90-day uptime
MailerSend
Twilio SendGrid
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent MailerSend incidents
- MaintenanceSep 23, 2026 · ongoing
Affected: Email analytics, Deliverability rate, MailerSend APP, Bulk endpoint, SMTP, Email activity +2 more
- MaintenanceSep 15, 2026 · ongoing
Scheduled maintenance - Email sending affected, 5 min
Affected: Email sending API, Inbound routing, Bulk endpoint, SMTP, Delivery time
Recent Twilio SendGrid incidents
- MaintenanceOct 29, 2026 · resolved in 1h 26m
[Scheduled] Sendgrid Maintenance Impacting Delivery and Account Configuration
- Degraded performanceOct 24, 2026 · resolved in 50m
Azure Marketplace SendGrid Customers Experiencing Account Management Issues
- InformationalOct 15, 2026 · resolved in <1m
- InformationalOct 2, 2026 · resolved in <1m
- MaintenanceSep 4, 2026 · resolved in 7h 16m
Multiple delivery failures when sending emails to Microsoft or MS based recipients
- MaintenanceAug 24, 2026 · resolved in 22d
Other transactional email APIs to consider
- Mailjet · #1 · 100% uptime
- Mailtrap Email Sending · #2 · 99.99% uptime
- Loops · #3 · 99.98% uptime
- Mailchimp Transactional (Mandrill) · #5 · 99.93% uptime
See the full most reliable transactional email apis ranking →