Dave Jones: > The past few weeks or so my Postfix relays have been showing "unknown" > in the logs and headers for some (not all) hosts causing a hit on the > SpamAssassin RDNS_NONE rule. These servers have a local caching DNS > server on them that forward to another pair of caching DNS servers > that run BIND and rbldnsd. I am able to resolve IPs to hostnames from > the command line with dig. This Postfix configuration has been > working fine for 2 1/2 years when I converted from sendmail.
Try turning off chroot operation in master.cf: http://www.postfix.org/DEBUG_README.html#no_chroot If that fixes the problem, you had chroot turned on, but with missing or outdated files under /var/spool/postfix. > # dig -x 96.4.3.90 +short > mail02.corp.ena.net. Postfix does not query DNS as root, so this test is invalid. Wietse
