[57352] in North American Network Operators' Group
Re: An A record is an MX record and is a missing MX....
daemon@ATHENA.MIT.EDU (Adam McKenna)
Fri Apr 4 15:04:18 2003
Date: Fri, 4 Apr 2003 11:40:55 -0800
From: Adam McKenna <adam@flounder.net>
To: nanog@merit.edu
Mail-Followup-To: nanog@merit.edu
In-Reply-To: <3E8CB4DF.A1E411A4@onecall.net>
Errors-To: owner-nanog-outgoing@merit.edu
On Thu, Apr 03, 2003 at 05:25:35PM -0500, Richard Irving wrote:
> It isn't exactly completely RFC compliant, but, it is only a -=Request=-, eh ?
It is in fact required that an MTA fall back to the A record for a domain if
an MX record does not exist. See RFC 2821, Section 5, "Address Resolution
and Mail Handling".
> > Obviously some admins I have encountered are starting to host mailservers
> > for sub-domains and domains without MX entries on their DNS zone records.
> > Relying on the A record alone.
>
> Lemmings make a mad dash towards a cliff, every so often, en masse....
This is a fallacy perpetrated by Disney.
http://www.snopes.com/disney/films/lemmings.htm
--Adam
