Hi, I have a reverse lookup problem that is causing our users some serious problems. We have a correctly configured PTR for our mailserver (217.158.60.30 - mailhost.websights.co.uk)
We run IMAIL with multiple virtual hosts and most mail is delivered no problem. However, when sending to Supanet we get a "550 EHLO argument does not match calling host" I am unsure where the problem is (see log excerpt below). Should Imail be presenting itself as mail.catpad.co.uk (which has an IP of 217.158.60.30 - same as mailhost.websights.co.uk) or catpad.co.uk (as it is below)? If I change the configuration of the domain in Imail so that it's official host name is mail.catpad.co.uk instead of catpad.co.uk it works, and supanet accepts the mail. As I understand it when Imail connects to a remote server, it can do a reverse lookup on the IP address and as long as there is an entry (mailhost.websights.co.uk in our case) all is well - it appears that supanet rejects us because imail has a helo of catpad.co.uk BUT as I said above when I change the official hostname to mail.catpad.co.uk all is well - am I misunderstanding? Does the helo have to be the mx record for the domain? If supanet looks up the IP for catpad.co.uk it will be the web server IP not the mail server IP. Most of our mail accounts are setup by an automated system and to change this would be difficult - and to change all of our domains manually would take ages. Any info people can shed on this would be much appreciated. Thanks in advance, Duncan. Non working configuration (HELO = catpad.co.uk): 10:07 16:15 SMTP-(00000748) processing C:\IMail\spool\Qd85e0c4.SMD 10:07 16:15 SMTP-(00000748) Trying supanet.com (0) 10:07 16:15 SMTP-(00000748) Connect supanet.com [213.40.130.10:25] (1) 10:07 16:15 SMTP-(00000748) 220 caddy.sin1.netline.net.uk ESMTP Exim 4.24 Tue, 07 Oct 2003 16:15:51 +0100 10:07 16:15 SMTP-(00000748) >EHLO catpad.co.uk 10:07 16:15 SMTP-(00000748) 550 EHLO argument does not match calling host 10:07 16:15 SMTP-(00000748) >HELO catpad.co.uk 10:07 16:15 SMTP-(00000748) 550 HELO argument does not match calling host 10:07 16:15 SMTP-(00000748) SMTP_DELIV_FAILED 10:07 16:15 SMTP-(00000748) >QUIT 10:07 16:15 SMTP-(00000748) 221 caddy.sin1.netline.net.uk closing connection 10:07 16:15 SMTP-(00000748) requeuing C:\IMail\spool\Qd85e0c4.SMP R0 T1 10:07 16:15 SMTP-(00000748) finished C:\IMail\spool\Qd85e0c4.SMP status=3 Working configuration (EHLO = mail.catpad.co.uk = mx record): 10:07 18:52 SMTP-(000003D8) processing C:\IMail\spool\Q43e3f87.GSC 10:07 18:52 SMTP-(000003D8) Trying supanet.com (0) 10:07 18:52 SMTP-(000003D8) Connect supanet.com [213.40.66.38:25] (1) 10:07 18:52 SMTP-(000003D8) 220 magnum.sin1.netline.net.uk ESMTP Exim 4.24 Tue, 07 Oct 2003 18:52:30 +0100 10:07 18:52 SMTP-(000003D8) >EHLO mail.catpad.co.uk 10:07 18:52 SMTP-(000003D8) 250-magnum.sin1.netline.net.uk Hello mailhost.websights.co.uk [217.158.60.30] 10:07 18:52 SMTP-(000003D8) 250-SIZE 2097152 10:07 18:52 SMTP-(000003D8) 250-PIPELINING 10:07 18:52 SMTP-(000003D8) 250 HELP 10:07 18:52 SMTP-(000003D8) >MAIL FROM:<[EMAIL PROTECTED]> 10:07 18:52 SMTP-(000003D8) 250 OK 10:07 18:52 SMTP-(000003D8) >RCPT To:<[EMAIL PROTECTED]> 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/
