troubleshooting Question

Block List

Avatar of Dennis Janson
Dennis JansonFlag for United States of America asked on
9 Comments3 Solutions1470 ViewsLast Modified:
I have Microsoft Exchange 2007 running smothly but lately I have been receiving complaints from a few employees that certain outside users cannot send them email. They receive this message

"550 5.7.1 Recipient not authorized, your IP has been found on a block list (in reply to RCPT TO command)

Is this problem on my exchange server? How can fix this?
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