maillog not logging pop3 checks

[Catherine Darklock]

Hi all -

I'm running a redhat 7.3 system with qpopper 4.0.3. I cannot figure out 
why the "maillog" log will not keep track of who is logging in and out 
of the server to check their pop3 mail. I'm used to seeing lines like this:

Nov 10 11:54:57 server1 ipop3d[12614]: pop3 service init from xx.xxx.xxx.xxx
Nov 10 11:54:57 server1 ipop3d[12614]: Login user=xxxxxx 
host=somehost.com [xx.xxx.xxx.xxx] nmsgs=0/0
Nov 10 11:54:57 server1 ipop3d[12614]: Logout user=xxxxxx 
host=somehost.com [xx.xxx.xxx.xxx] nmsgs=0 ndele=0

But for some reason the maillog for this server isn't catching the 
logins or logouts. Is there a way that I can change this? I really need 
to keep track of it for debugging purposes.

Thanks.