[cobalt-security] Raq2 pop problem

[Atsushi Tamae <atamae@xxxxxxx>]

 I am working at ISP in Japan.
We have some compain about pop time out problem.
According to the  maillog, when user access to the pop, qpopper lookup 
clients FQDN address.
But it is strange to me.
Is it able to fix ?

Sep  5 15:07:25 ns in.qpopper[19902]: EOF from  at 211.10.18.97 (211.10.18.97):
[0] 29 (Illegal seek); 0 (Success)
Sep  5 15:07:25 ns in.qpopper[19902]: (null) at 211.10.18.97 
(211.10.18.97): -ER
R POP EOF or I/O Error: 29 (Illegal seek); 0 (Success)
Sep  5 15:07:32 ns in.qpopper[19903]: (v?) Unable to get canonical name of 
clien
t 211.10.18.97: Host name lookup failure (2)
Sep  5 15:07:32 ns in.qpopper[19903]: EOF from  at 211.10.18.97 (211.10.18.97):
[0] 29 (Illegal seek); 0 (Success)
Sep  5 15:07:32 ns in.qpopper[19903]: (null) at 211.10.18.97 
(211.10.18.97): -ER
R POP EOF or I/O Error: 29 (Illegal seek); 0 (Success)
Sep  5 15:08:28 ns in.qpopper[19906]: (v?) Unable to get canonical name of 
clien
t 211.10.18.97: Host name lookup failure (2)
Sep  5 15:08:28 ns in.qpopper[19906]: (v?) POP login by user "toei046" at 
(211.1
0.18.97) 211.10.18.97
Sep  5 15:08:35 ns in.qpopper[19907]: (v?) Unable to get canonical name of 
clien
t 211.10.18.97: Host name lookup failure (2)
Sep  5 15:08:35 ns in.qpopper[19907]: EOF from  at 211.10.18.97 (211.10.18.97):
[0] 29 (Illegal seek); 0 (Success)
Sep  5 15:08:35 ns in.qpopper[19907]: (null) at 211.10.18.97 
(211.10.18.97): -ER
R POP EOF or I/O Error: 29 (Illegal seek); 0 (Success)

Please help about it.

Thanks
Atsushi Tamae