Hotmail Email Problems
Life is never easy! It turns out that the previous owner of our new IP address allowed an open relay to run on the server with the result that the IP address is on a black list at Hotmail - this means that although all of the email going to Hotmail appeared to be being sent ok it was in actual fact being deleted!
I’ve found that the fastest solution was just to edit Postfix’s main.cf to get it to bind to another of my IP addresses. I had to add an ’smtp_bind_address’ directive.
I am pretty annoyed about how Microsoft handle this. Every email that was being sent was being acknowledged by Microsoft with a received ok (250) code. If they’d been bouncing the mails or refusing to accept the connection at least I would have known what was going on. As it is I’ve lost days of mail and have hundreds of annoyed users.
UPDATE: Microsoft’s postmaster got back to me; it turns out they replied to me pretty quickly but unfortunately Yahoo’s spam filter put their mail in my junk box! Anyway their response was that I should publish some SPF records which I guess I should. In addition, I really should get Domain Keys running.