5.4.14 Hop count exceeded – possible mail loop ATTR34

Issue: We recently configured our Exchange Hybrid setup and were experiencing this error when sending mail from our mailboxes migrated to Exchange Online to the mailboxes still on Premise that had the alias: (On Premise Mailboxes had this alias setup in preparation for migrating to Exchange Online). Cause: We use Mimecast for our email filtering. The mail loop was…

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