Quoting Bryan Ladd ([EMAIL PROTECTED]): > Hello, I'm rather new to administering a Mail server, I'm running Exim 3.35 > and qpopper v4.04 on Debian Woody 2.4.20 My question is in my syslog, I > keep getting this canonical error when anyone on my 13 subnets checks thier > email with outlook or outlook express. Is there a way I can turn off the > canonical lookup for something like 192.168.0/24.0/24? Is this even a > problem other than filling up the syslog? Am I even thinking in the right > direction? > > Mar 22 15:27:43 mydomain in.qpopper[28862]: connect from 192.168.12.124 > Mar 22 15:27:43 mydomain in.qpopper[28862]: (v4.0.4) Unable to get canonical > name of client 192.168.12.124: Unknown host (1) [pop_init.c:1075] > Mar 22 15:27:48 mydomain in.qpopper[28862]: (v4.0.4) POP login by user > "jones" at (192.168.12.124) 192.168.12.124 [pop_log.c:244] > > Bryan Ladd > Tapestry Health Systems > cell: 413.222.0291 > desk: 413.586.2016 x 108
Chant with me: If it has an IP address, then your DNS will have an entry both forward and backward. Ok, no rhymes or anything, but over and over and over, I run into clients who DON'T do this and they work around it all over the place. You MUST spend the effort. Either you'll spend the effort and do it right, or you'll spend the effort working around it. If it has an IP address, then it has forward and reverse DNS. Make your DNS admin write it 100 times on the blackboard. Sing it at her down the hall. Paint it in whiteboard marker on her windshield. And life will be good. Otherwise, you choose the dark side of DNS and your life will suck for all time there.
