Potential Email API/SMTP issues
Between 11:09 and 12:11 UTC, requests using newly created API tokens or newly added domains could intermittently fail via the Email API and SMTP. Some SMTP health checks on ports 587 and 2525 also failed briefly. Existing senders and ongoing bulk/campaign sends were largely unaffected. A subset of demo and forwarded emails experienced delays.
What happened
A database change shipped without the required indexes, causing slow queries and timeouts in token validation and SMTP health checks. New tokens and domains were most affected.
What we fixed
We added the missing indexes and verified recovery. All health checks are passing and delivery is operating normally.
Pingdom says we are back online.
Most likely affects new domains / API tokens only. We don't see issues for the majority of existing customers. We are investigating.
Pingdom says we are down, the team is checking...
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Email Sending API/SMTP
- SMTP
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