Fix a Mail Loop

A message trapped bouncing endlessly between servers, usually from something auto-replying to its own automated replies.

Common causes

Workflows triggering each other in a circle. Auto-responders replying to automated messages without excluding automated senders. Domain/DNS conflicts from multiple services handling the same domain.

How to fix it

1. Review domain configuration for MX duplicates/conflicts.
2. Check bounce reports for repeated back-and-forth patterns.
3. Audit workflows/auto-responders for circular triggers — skip automated senders.
4. Clean up DNS/MX records, allow 24–48 hours to propagate.
5. Remove circular forwarding rules at the registrar level.

Confirming it's fixed

Pause the affected workflow, send a test, confirm it routes correctly. Resume at small volume first.