Hi Scott, I can't disagree with you. So that means I was right in my first message, when Andrey asked about the problem with mail rejecting, and my answer was "put your PTR record on the appropriate DNS".
> I have never, ever seen a mailserver do this (although I believe Len > has). Mailservers that reject the mail based on the HELO not matching the > reverse DNS entry are violating the RFCs, and will drop HUGE amounts of > legitimate mail. > > Note that AOL will often silently drop E-mail from mailservers with no > reverse DNS entries (it has some sort of weighting system), which is VERY > strict, but there is no sign that even they care about the HELO/revdns > matching. > > >So if his SMTP says HELO client1domain.com, a PTR record for the name > >client1domain.com has to exist in Reverse Lookup Zone > >333.222.111.in-addr.arpa, period. > > No. There's no need to give in to those people. There's no reason to have > a reverse DNS entry of mail.example.com if the mailserver says HELO > mail.other_domain.com (except to please the very, very small percent of > mailservers that do that, knowing they will not get a lot of their > legitimate mail). You're right. I've seen very few of such servers. But still, they exist. You know, it's very difficult to explain your client why his messages are rejecting by particular server while others are able to send messages there. So I think it's nothing wrong to have a PTR, anyway... > > >5. The trick is you may have only one PTR record for some particular IP > >address, and I assume he has it already for imail.earthlink net (to > >simplify, we are not talking about round robin stuff... never tried round > >robins in reverse zones, though) > > A lot of people have multiple PTR records, but virtually all reverse DNS > tools only look at the first entry, so having just one reverse DNS entry is > the best practice. So what's the reason they keep multiple records? Alex 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/
