None for mailservers specifically, but RFC 1912 states "Every Internet-reachable host should have a name." and then "For every IP address, there should be a matching PTR record in the in-addr.arpa domain." and "Failure to have matching PTR and A records can cause loss of Internet services similar to not being registered in the DNS at all."
Using this RFC, it is logical that testing for a PTR record is equivalent to testing for valid Internet Hosts. So testing an incoming mail server for a PTR record can be said to be the equivalent of testing for a valid mail server. You won't find any RFC, I think, that specifically says "A mail server must have a valid reverse DNS pointer in order to deliver mail." -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of list Sent: Friday, June 10, 2005 5:03 PM To: [email protected] Subject: [IMail Forum] which rfc is it? All, Can anybody tell me which rfc states that mailservers must have a reverse-lookup? Thanks, Jon To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
