Sandy, Thanks for the clarification. It sounds like I have been wrongly assuming that the reason for the rejection was the domain name showing up in the email envelope/header whereas if i understand you correctly, the remote host is getting the our server's hostname during the HELO greeting stage of the transaction.
The server in question is water.ndic.com which is also ns1.ndic.com. The PTR record points to ns1.ndic.com. I'm not sure what my server answers as to the HELO greeting, but I'm guessing it's water.ndic.com NOT ns1.ndic.com which must be my problem. Does this sound like good logic? Is there an easy way to tell how my server is responding to the HELO? Also, it's a Win2k Advanced Server. To change the hostname that it answers as do I just change it in the Network properties of the server and Imail will pick that up? Thanks, Masen On Thu, 1 Jul 2004 13:36:48 -0400, Sanford Whiteman <[EMAIL PROTECTED]> wrote: > > > Exactly my understanding. > > Eh, no. I don't think you followed Len precisely. > > > Further, it's my understanding that reverse checks done by other > > mail servers on mail that we send looks at the sender domain in the > > envelope of the email and the IP address of the machine sending the > > email (also in the envelope) then does a reverse lookup on the IP to > > see if it matches the domain. > > No, this is not the case. The PTR and the MAIL FROM: domain do not > need to match (unless you are deliberately using mechanisms such as > SPF and the remote server is checking your SPF records--not to confuse > the issue, but this is an exception). > > > If it doesn't, they reject the email causing the "blocking call > > cancelled" errors in the Imail SMTP log. > > I doubt you've established that this is the reason that the connection > is dropped. > > > By default, Imail writes the virtual domain to the email > > envelope... > > IMail echoes the virtual host's official host name in the EHLO/HELO > greeting. You _do_ need to have an A record corresponding to the > official host name. > > > ...and since we have multiple virtual domains, the IP never reverses > > to that domain. > > That's not your problem. You surely are missing another ingredient: > correctly delegated PTR; sender-IP-to-PTR-to-A-to-sender-IP mapping; > extant A record for official host name; and extant A/MX record for > envelope sender domain are other places to look. If you provide the > real IP and DNS info, we can look into further from remote locations. > > --Sandy > > ------------------------------------ > Sanford Whiteman, Chief Technologist > Broadleaf Systems, a division of > Cypress Integrated Systems, Inc. > e-mail: [EMAIL PROTECTED] > > SpamAssassin plugs into Declude! > http://www.mailmage.com/products/software/freeutils/SPAMC32/download/release/ > > Defuse Dictionary Attacks: Turn Exchange Addresses into IMail Aliases! > > http://www.mailmage.com/products/software/freeutils/exchange2aliases/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/ > 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/
