The problem I encounter is that in the getMail configuration of a certain project, whenever an e-mail is retrieved the project's mailbox is added in the list of watchers for the issue created.
As of this action for any comment added, the project's mailbox gets a notification E-mail which is then consumed again by the E-mail handler thus creating a loop.
Try to analise custom event listeners. Maybe you have one to do this. Inspect it in order to find usages of WatcherManager(https://docs.atlassian.com/jira/6.4.3/com/atlassian/jira/issue/watchers/WatcherManager.html)
There is an MS Exchange mailbox (and a corresponding Active Directory user), named "cs10-support".
This e-mail address is specified in the Notifications Scheme's "project e-mail address" (see screenshot below).
So it is used
The problem is, as mentioned, that whenever an e-mail is fetched and processed from this mailbox, the handler arbitrarily adds Cc: email@example.com (well, actually, cedefop.europa.eu, but removing this for spam reasons). See screenshot 2 below.
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