Transactional Email APIs · reliability comparison
Mailchimp Transactional (Mandrill) vs SMTP2GO: which is more reliable? (2026)
Mailchimp Transactional (Mandrill) is more reliable than SMTP2GO, scoring 90.6 vs 58.4 out of 100. Over the last 90 days Mailchimp Transactional (Mandrill) reported 3 incidents and SMTP2GO reported 17, with effective uptime of 99.93% and 99.17% respectively. Mailchimp Transactional (Mandrill) resolves incidents faster on average (3h 4m).
Data updated Nov 1, 2026 · How we score
| Metric | Mailchimp Transactional (Mandrill) | SMTP2GO |
|---|---|---|
| Reliability score | 90.6 | 58.4 |
| Rank (transactional email APIs) | #5 | #12 |
| Uptime (90 days) | 99.93% | 99.17% |
| Incidents (90 days) | 3 | 17 |
| Partial / major outages | 0 | 3 |
| Avg time to resolve | 3h 4m | 5h 39m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Mailchimp Transactional (Mandrill) and SMTP2GO differ
- SMTP2GO reported 5.7× as many incidents as Mailchimp Transactional (Mandrill) over the last 90 days (17 vs 3).
- SMTP2GO had 3 partial or major outages, compared with 0 for Mailchimp Transactional (Mandrill).
- Mailchimp Transactional (Mandrill) fixes problems faster: 3h 4m on average, against 5h 39m for SMTP2GO.
- Mailchimp Transactional (Mandrill)'s longest incident on record lasted 4h 26m (Sep 15, 2026); SMTP2GO's lasted 1d 4h (Jan 22, 2026).
90-day uptime
Mailchimp Transactional (Mandrill)
SMTP2GO
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Mailchimp Transactional (Mandrill) incidents
- Degraded performanceSep 17, 2026 · resolved in 38m
Delayed Deliveries via Mandrill
Affected: Delayed Deliveries via Mandrill
- Degraded performanceSep 15, 2026 · resolved in 4h 26m
Delayed Deliveries via Mandrill
Affected: Delayed Deliveries via Mandrill
- Degraded performanceSep 1, 2026 · resolved in 4h 8m
Affected: Mandrill/Transactional Delays
Full Mailchimp Transactional (Mandrill) reliability report →
Recent SMTP2GO incidents
- Degraded performanceOct 30, 2026 · resolved in 10h 12m
Affected: API Servers
- Partial outageOct 15, 2026 · resolved in 2h 20m
Softbounce Errorsofficial update ↗
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 →