Transactional Email APIs · reliability comparison
Resend vs SMTP2GO: which is more reliable? (2026)
Resend is more reliable than SMTP2GO, scoring 60.5 vs 58.4 out of 100. Over the last 90 days Resend reported 23 incidents and SMTP2GO reported 17, with effective uptime of 99.39% and 99.17% respectively. Resend resolves incidents faster on average (3h 39m).
Data updated Nov 1, 2026 · How we score
| Metric | Resend | SMTP2GO |
|---|---|---|
| Reliability score | 60.5 | 58.4 |
| Rank (transactional email APIs) | #10 | #11 |
| Uptime (90 days) | 99.39% | 99.17% |
| Incidents (90 days) | 23 | 17 |
| Partial / major outages | 4 | 3 |
| Avg time to resolve | 3h 39m | 5h 39m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Resend and SMTP2GO differ
- Resend reported 35% more incidents than SMTP2GO over the last 90 days (23 vs 17).
- Resend had 4 partial or major outages, compared with 3 for SMTP2GO.
- Resend fixes problems faster: 3h 39m on average, against 5h 39m for SMTP2GO.
- Resend's longest outage on record lasted 2h 39m (Aug 8, 2026); SMTP2GO's lasted 1d 4h (Jan 22, 2026).
90-day uptime
Resend
SMTP2GO
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Resend incidents
- Degraded performanceOct 26, 2026 · resolved in 23m
Affected: Email Events
- Degraded performanceOct 23, 2026 · resolved in 49m
Intermittent latency spikes on our emails API
Affected: Single Email, Broadcast Emails, Batch Emails, Scheduled Emails
- Degraded performanceOct 10, 2026 · resolved in 1h 9m
Delayed new team provisioning and contact webhook delivery
Affected: Webhooks, Dashboard, General API
- Degraded performanceOct 9, 2026 · resolved in 23m
Delayed new team provisioning and contact webhook delivery
Affected: Dashboard, General API, Webhooks
- Degraded performanceOct 1, 2026 · resolved in 52m
- Degraded performanceSep 26, 2026 · resolved in 2h 46m
Recent SMTP2GO incidents
- Degraded performanceOct 30, 2026 · resolved in 10h 12m
Affected: API Servers
- Partial outageOct 15, 2026 · resolved in 2h 20m
Affected: Email sending (SMTP service)
- InformationalOct 8, 2026 · resolved in 1h 26m
Issues with API- statusCode=500
Affected: API Servers
- Degraded performanceOct 1, 2026 · resolved in 8h 26m
Affected: Email sending (SMTP service)
- InformationalOct 1, 2026 · resolved in 33m
Connection issues and 'processed' emails
Affected: Email sending (SMTP service)
- InformationalSep 30, 2026 · resolved in 8m
Issues connecting to mail.smtp2go.com
Affected: Email sending (SMTP service)
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 →