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I deleted a user account, "email@example.com". Since, I removed said account, everyone who emails "firstname.lastname@example.org" is receiving a bounce back which indicates a delivery failure:
Failed Recipient: email@example.com
Reason: The recipient does not exist
firstname.lastname@example.org is not listed as a forwarding address for email@example.com, nor is it associated with any groups. I've looked through just about everything in the admin panel... anyone have any ideas?