Transactional Email APIs · monthly outage report
Transactional Email APIs outages: September 2026
The 14 transactional email APIs we track reported 46 incidents in September 2026. Resend reported the most (11). 4 had a clean month: Amazon SES, Mailchimp Transactional (Mandrill), MailerSend, Twilio SendGrid.
| Vendor | Incidents | Partial / major |
|---|---|---|
| Resend | 11 | 2 |
| Brevo | 10 | 2 |
| SMTP2GO | 9 | 2 |
| Mailgun | 4 | 1 |
| Postmark | 4 | 0 |
| Elastic Email | 2 | 1 |
| Mailtrap Email Sending | 2 | 0 |
| SparkPost (Bird) | 2 | 0 |
| Loops | 1 | 0 |
| Mailjet | 1 | 0 |
| Amazon SES | 0 | 0 |
| Mailchimp Transactional (Mandrill) | 0 | 0 |
| MailerSend | 0 | 0 |
| Twilio SendGrid | 0 | 0 |