Minor incident

SMTP2GO: Inbound Timeout

Affected: Email sending (SMTP service)

Current status of SMTP2GO: Operational — live SMTP2GO status

Timeline

1. Sep 29, 2026, 20:31 UTC
   identified
   Inbound processing time has decreased due to higher than usual demand. We are adding network capacity to address this.
2. Sep 29, 2026, 22:23 UTC
   resolved
   This incident has been resolved.
3. Sep 29, 2026, 22:54 UTC
   postmortem
   We investigated reports of SMTP connection timeouts and found that some of our incoming mail servers had accumulated stuck mail-handling processes. These processes were consuming excessive processing power, reducing the servers’ capacity to handle other connections and potentially causing slow responses or timeouts. Our investigation identified a possible fault in the handling of an SMTP authentication method. Diagnostic checks showed a process attempting to respond after a connection had closed. We are investigating whether this caused the processes to become stuck; the exact trigger has not yet been confirmed. Actions removed the observed resource buildup, but we are continuing to monitor for recurrence. We are preparing mail-server software updates and assessing whether they address the underlying fault. We are also evaluating a safeguard to detect and clear stuck processes before they affect service.

Updates as published by SMTP2GO (original).