> > I have never, ever seen a mailserver do this (although I believe Len > > has).
no, I haven't seen this. the helo/ehlo hostname needs to there, and needs to have A and/or MX records in DNS, but I've not heard of the helo hostname being tied to the PTR hostname. What can be done is that the ip is reversed to obtain the PTR hostname (this needs to be delegated and the PTR needs to exist), which hostname is then queried for its A record. postfix can reject if the ip of the sending MTA gives a PTR hostame which does not have a matching A record. Note that this does not put any requirement on what the PRT hostname should be. Len Please visit http://www.ipswitch.com/support/mailing-lists.html to be removed from this list. An Archive of this list is available at: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Please visit the Knowledge Base for answers to frequently asked questions: http://www.ipswitch.com/support/IMail/
