Hi, >> X-Envelope-From: <u...@lanyon.com> >> Received: from S253906HZ1EW06.usstls6-hosting.savvis.net (unknown >> [209.16.192.170]) >> >> Is it because there is no reverse DNS entry? > > As the documentation [1] clearly states, the second value (a) is a > string matched against the relay's rDNS in the Received headers, and > (b) it is your MX's responsibility to perform the rDNS lookup and add it > to the header. > > The latter is key, because despite "no reverse DNS entry" being > ambiguous, there actually is an rDNS entry for the IP. In DNS, it's > merely missing from the Received header. > > $ host 209.16.192.170 > 170.192.16.209.in-addr.arpa domain name pointer Lanyon.com. > > So, fix your MX. :) With an rDNS entry in the header, you will need to
I'm not it's a problem with my system. It's not that IP that has the problem, but with the host itself: $ host S253906HZ1EW06.usstls6-hosting.savvis.net Host S253906HZ1EW06.usstls6-hosting.savvis.net not found: 3(NXDOMAIN) I suppose I could add that host to /etc/hosts, but is there another way to whitelist mail from this host/domain to a specific user? There are also no SPF records to use... Thanks again, Alex
