[smtp] Problems with outbound sending on custom SMTP channels

Incident Report for Front

Resolved

This incident has been resolved.
Posted Oct 05, 2026 - 09:45 UTC

Monitoring

The fix is deployed and the problem appears to be resolved. We are continuing to monitor.
Posted Oct 05, 2026 - 09:13 UTC

Identified

We believe we have identified the cause and are deploying a fix.
Posted Oct 05, 2026 - 08:34 UTC

Investigating

We are investigating a spike in failures for outbound sending on a subset of custom SMTP channels.
Posted Oct 05, 2026 - 07:42 UTC
This incident affected: SMTP (non-Gmail / O365).