Hi Sorry if this is slightly off-topic.
For the first time I've had to deal with classless reverse dns for a /25 subnet assigned to me. Thus, I've asked my IP provider to delgate rdns for the entire /25 to my dns servers. This is done in a way such that a reverse lookup looks a little different than normal by introducing an extra CNAME lookup step (see example below) and I'm simply wondering if I could run into problems with certain smtp servers when delivering mail to them from my courier server (slash.sentinel.dk). frede...@fda-lenny:~$ host 95.128.25.121 121.25.128.95.in-addr.arpa is an alias for 121.0.25.128.95.in-addr.arpa. 121.0.25.128.95.in-addr.arpa domain name pointer slash.sentinel.dk. frede...@fda-lenny:~$ dig -x 95.128.25.121 ; <<>> DiG 9.5.1-P3 <<>> -x 95.128.25.121 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49385 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0 ;; QUESTION SECTION: ;121.25.128.95.in-addr.arpa. IN PTR ;; ANSWER SECTION: 121.25.128.95.in-addr.arpa. 86394 IN CNAME 121.0.25.128.95.in-addr.arpa. 121.0.25.128.95.in-addr.arpa. 10794 IN PTR slash.sentinel.dk. ;; AUTHORITY SECTION: 0.25.128.95.in-addr.arpa. 4918 IN NS ns01.sifira-ums.dk. 0.25.128.95.in-addr.arpa. 4918 IN NS ns02.sifira-ums.dk. ;; Query time: 0 msec ;; SERVER: 192.168.1.33#53(192.168.1.33) ;; WHEN: Thu Sep 3 16:34:37 2009 ;; MSG SIZE rcvd: 144 Best regards, Frederik Dannemare ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
