This observation may not be a bug, per-se, but it's certainly something users will want to avoid.
Some of our Service Desk inboxes have multiple aliases for the same box. For example: support@acme.com, support@acmeco.com, ...
When a user e-mails the one of these aliases, the alias is added as a customer and listed in the ticket participants.
In the event of any comment notification -- the notification is e-mailed to the alias e-mail address participant, which is routed back to the Service Desk inbox and treated as a new comment, which triggers another round of notification.
This looping can be pretty high speed, and cause a great amount of customer frustration.
I solved by adding a ScriptRunner script to remove any inbox alias from the participant fields.
Has anyone else encountered this?