> It seems the problem is that their server sends mail out identifying > itself as pacificrimcamera.com (with no host name), but the IP is a > Qwest IP, so Comcast apparently doesn't like the mismatch. So the > question is, what are the best solutions for this?
Your server must complete a HELO-PTR-A-IP "DNS roundtrip" to ensure delivery. That is, the PTR for the public IP of the box must match the HELO sent by that IP; the PTR must also have a corresponding A record that points back to the originating IP. While some mailservers may only enforce a part of the roundtrip, there are enough servers out there enforcing each or all parts to make the roundtrip a best practice. So the public IP of the host announcing itself as pacificrimcamera.com must have a PTR of pacificrimcamera.com. However, you say that you also host their web site. Since most people point example.com and www.example.com to the same IP, it is unlikely that they can continue using the HELO pacificrimcamera.com, since that cannot be the canonical name of their Exchange machine. If Quest will change the PTR, choose a HELO that's unique to that box and work with that new HELO. If Qwest will not change or delegate the PTR, then change the HELO to match the fixed PTR. > We could setup a DNS record (except that I don't have a host name). > . . You do have a hostname: pacificrimcamera.com is being used a hostname in this case. But, as above, it is unlikely to fit into the roundtrip requirement. > . . . for their server, or we could tell them to change the name of > their server to something.qwest.net, or we could call Comcast, or > what? The ideal situation would be that Qwest can match the PTR to a new HELO. Don't bother calling Comcast. There's nothing they're requiring here that's irrational. --Sandy ------------------------------------ Sanford Whiteman, Chief Technologist Broadleaf Systems, a division of Cypress Integrated Systems, Inc. e-mail: [EMAIL PROTECTED] SpamAssassin plugs into Declude! http://www.imprimia.com/products/software/freeutils/SPAMC32/download/release/ Defuse Dictionary Attacks: Turn Exchange or IMail mailboxes into IMail Aliases! http://www.imprimia.com/products/software/freeutils/exchange2aliases/download/release/ http://www.imprimia.com/products/software/freeutils/ldap2aliases/download/release/ 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/
