Last week, emails from our server to Hotmail were being returned with a message "Error 550 - Command rejected for Policy Reasons". We contacted MSN and were advised that we were on the Symantec Brightmail List.
Investigation of our exchange server suggested that we had been subject to a NDR attack, as we had lots of messages in our queue from a postmaster account. We have now dealt with these issues and the queues on the server appear to be normal at present.
However, I need to know how we get off this list. I have tried emailing firstname.lastname@example.org , as suggested by MSN, but haven't received any reply. Does anybody else have any suggestions as to what to do?
All suggestions would be gratefully received.