Martin Vegter: > Hello, > > I have noticed that my Postfix never resolves client IP Addresses into > hostnames. In the logs I have always entries like the following: > > connect from unknown[173.194.40.54] > > I can resolve the IP manually into FQDN, using dig or host commands: > > host 173.194.40.54 > > So any DNS misconfiguration on my server is ruled out.
Postfix will ignore the name if it does not resolve to the client IP address (it will also log a warning to that effect). > Do I ned to change any settings in postfix, so that client IPs are > resolved into hostnames? You need the correct DNS server in /etc/resolv.conf. You must not have "disable_dns_lookups=yes" in main.cf or master.cf. You must not have "smtpd_peername_lookup=no" in main.cf or master.cf. You may also need to turn off chroot per instructions in http://www.postfix.org/DEBUG_README.html#no_chroot Wietse
