We are recieving thousands of "Delivery Status Notification (Failure)" by "MAILER-DAEMON@***.rr.com emails to a bad address on our domain each hour. The emails overloaded our exchange server Saturday an dwe had to reboot them. We are running GFI on email relays on our perimeter SMTP servers but adding the bad email address has not stoped them. I have blocked many of the IPs of the servers sending the emails but they keep changing. How can I stop them.
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Stop "Delivery Status Notification (Failure)" emails
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