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Is Hotmail in the habit of ignoring MX records?

Subject: Is Hotmail in the habit of ignoring MX records?
From: gbonser at seven.com (George Bonser)
Date: Thu, 26 Jul 2012 16:12:24 +0000
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>

> From: Ryan Rawdon 
> Sent: Thursday, July 26, 2012 7:06 AM
> To: nanog at 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

References:
- Is Hotmail in the habit of ignoring MX records?
  - From: lou at metron.com (Lou Katz)
- Is Hotmail in the habit of ignoring MX records?
  - From: ryan at u13.net (Ryan Rawdon)

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