This is a strange one. Our Exchange Server 2003 started having strange receive problem about a week ago. One or the first receive issues was from Outlook 365 accounts. Mail sent to it from Outlook 365 accounts would just not show up. The few bounce message that it did generate were to the effect that it timed out trying to deliver the message.
Only by trying a million different things did I stumble across the SSL Cert. If I re-key the cert mail from Outlook 365 accounts will start coming I to the server again but only for about 6 hours and then they stop. Re-keying the SSL cert seems to start it again but only for 6 hours. Very strange.
No signs of errors. Nothing in the logs. Microsoft's analyzer says things are perfect. GoDaddy looked at the site and said the cert was fine. Has anyone ever seen such a thing? Any ideas?