Am I to understand that Postfix will first try to lookup the MX record via DNS and if should that fail it will use the value configured in the /etc/hosts file?
-Andreas -----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Wietse Venema Sent: Monday, September 12, 2011 12:36 PM To: Postfix users Subject: Re: Postfix Question: strange issue with mx record lookup Andreas Freyvogel: > The email address to which we are sending is "u...@mmm.com". Postfix will send to the A record for mmm.com if MX lookup is disabled, or if MX lookup results in a "not found" response (either NXDOMAIN or NODATA). Postfix does not send to the A record if MX fails due to any other error such as timeout or server failure. If your MX lookups "by hand" succeed and Postfix still sends to the /etc/hosts address, then something is broken at your end. Perhaps you have an outdated (or missing) etc/resolv.conf file in the Postfix queue. With a missing etc/resolv.conf file, some resolvers will contact the DNS server on 127.0.0.1. And with an outdated etc/resolv.conf, anything could happen. Wietse
