After identifiying a mail system that is causing our customers problems on the DNS Reports site, I sent them an e-mail with the link that stated that their mail system had problems, and could they address it. Mainly their mx didn't accept postmaster or abuse. Here is their reply:
Actually I wouldn't expect a postmaster account at lower priority MX
server. dnsreports is a good place to start but frequently gives
misleading or incorrect info. You can't just blindly take what it says as
being correct. You have to know enough about DNS to evaluate it's
results.
Am I missing something here, or did someone start the Crack party early?
He's wrong with a bit of right mixed in. The information at www.DNSreport.com should always be accurate (we always respond to any reports of inaccuracies, which *can* happen). However, hidden in his message is that not everything that the www.DNSreport.com site reports needs to be addressed.
Shouldn't any listed MX accept mail to the postmaster account:? And if NOT, then what circumstances would warrant not accepting it?
This is where he is showing his lack of knowledge. If one mailserver in an MX records accepts E-mail to a specific address, but another does not, you've got a discrepancy: The address both does and does not exist. In the case of a postmaster@ address, if a single mailserver in the MX record doesn't accept mail to it, it doesn't fully exist, and doesn't meet the requirements of the RFCs (since E-mail to the postmaster@ account may bounce).
-Scott
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