[141145] in North American Network Operators' Group
messagelabs.com contact - SMTP-side domaincheck checks IPv4 only,
daemon@ATHENA.MIT.EDU (Jeroen Massar)
Sun Jun 5 09:23:26 2011
Date: Sun, 05 Jun 2011 15:22:21 +0200
From: Jeroen Massar <jeroen@unfix.org>
To: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
As the subject states,
MAILER-DAEMON@messagelabs.com:
<....@ford.com>:
Connected to 136.1.7.8 but sender was rejected.
Remote host said: 501 Sender domain must exist
As it obviously checks only the first MX record if there are A records,
and if there are none it rejects it. This while there are AAAA records
on the first MX, and even A records on the remaining MXs. Thus a proper
fix would already be to check the other MXs and of course to check for
AAAA too ;)
And that affects all customers at messagelabs, thus if somebody can pass
that along to them to fix it, that would be great ;)
Oh and of course the check is also there for postmaster@ thus no way to
tell them through that route.
Greets,
Jeroen
