RE: Is Hotmail in the habit of ignoring MX records?

From: Ryan Rawdon Sent: Thursday, July 26, 2012 7:06 AM To: nanog@nanog.org Subject: Re: Is Hotmail in the habit of ignoring MX records?

No solution to the issue was found in the various forks of that thread, however one individual afflicted by this issue (the OP) seems to have resolved his specific issue with Hotmail by fixing his MX records to be in stricter compliance with RFCs and best practices (removed a CNAME) - that said, per the quote above Hotmail should not have been falling back to the A records or any other RRs for the hostname.

I would say MX pointing to a CNAME instead of pointing to an A record is the #1 cause of intermittent mail delivery problems I have seen. Some MTAs seem to tolerate it, some don't. G