Here is the result of bad planning. I am wondering if there is a way to fix this without re-building the entire mailserver.
The Postfix program
<firstname.lastname@example.org>: host gateway-s.comcast.net[220.127.116.11] said:
521-EHLO/HELO from sender 18.104.22.168 does not map to
webmail.avmax-internal.net in DNS 521-sending machine name must be provided
as a fully 521-qualified domain via EHLO/HELO command. 521-see section
22.214.171.124 and 4.1.4 of RFC 2821 521 521: Comcast requires that all mail
servers must have a PTR record with a valid Reverse DNS entry. Currently
your mailserver does not fill that requirement. For more information, refer
to: http://www.comcast.net/help/faq/inde...aq=Email118405 (in reply to
MAIL FROM command)
This is because when I built the Zimbra box back in October 2005 as a test/trial, I configured it with an "internal" domain: avmax-internal.net that has no presence on external DNS servers.
However now that I am in love with Zimbra and am slowly weening my users off of Outlook, I have simply set up "aliase" domains, I.E.: avmax.ca and a few others.