Mailer Daemon Undeliverable Mail: Receiving thousands of these on one email account. Non Exchange environment and it follows the email address not the PC.
I have a couple of email addresses that are getting thousands of emails that read: Mailer Daemon@.... Undeliverable Message. There seems to be a pattern in the subject line with only 2 variations after the Undeliverable Message part. I tried deleting the users email account and re-adding as well as take his old PC off the network and setup his email on a new PC but he's still receiving thousands of these emails an hour. I'm sure it's spoofing but how do I get these emails account to work again or are they a lost cause?
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