client host rejected: cannot find your hostname.
... is exact text of postfix logging. "hostname" is postfix code word for HELO hostname. Often, eg IMGate, won't reject for bad HELO alone, but for 2 conidtions, no PTR and unknown HELO. Non-IMGate postfix could be set up to reject on unknown HELO hostname alone.
I believe that what is happening is that some mail servers are trying to resolve the internal name of the mail server (email.headquarters.ilx.com) to the public external address of 216.167.71.99 when the external name is email.ilx.com. This happens very seldom, and usually with email servers in foreign countries. Is there something I should change/add in my Imail setup to account for this?
If it really is random, episodic and with foreign MXs, and your Imail has a PTR and good HELO hostname, then the failure could be due to DNS delays causing DNS query timeout. With postfix, DNS timeouts cause rejections with 4xx, not 5xx. Chances are, when your Imail retries, DNS will not time-out.
Len _____________________________________________________________________ http://IMGate.MEIway.com : free anti-spam gateway, runs on 1000's of sites 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/
