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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Mailserver requirements
On Mon, 05 Apr 2004 23:03:05 +0200, Arnold Nipper <[email protected]> said: > Today I run across a MTA which refused to accept mail because it could > not detect an MX record for the reverse mapping of the IP address of the > server which tried to deliver mail. Is this correct? Depends on your definition of "correct". Checking that there's a PTR and A record that match has become common, although not strictly standard. Checking that said PTR points to a hostname that has an MX is certainly "way out there". > Or: if A is the IP Address of server trying to deliver mail, does > mx(reverse(A)) have to exist? There's no RFC requirement that an MX exist at all (only that you check for an MX before using the A record). The last 2 AOL boxes I got mail from were omr-m07.mx.aol.com and rly-ye05.mail.aol.com. I'm not seeing an MX for either of those. Draw your own conclusions as to whether a Randy Bush quote is needed.... Attachment:
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