[newbie] PAM problem

[Quaylar]

hi all !

i am experiencing following problem :

i am trying to login to my qpopper (pop3) server and get following PAM error :

PAM_pwdb[2237]: authentication failure; (uid=0) -> mylogin for pop3 service

does anyone know why this happens ?......
this is mysterious because my user login doesnt have uid=0......neither gid=0.

this is my /etc/pam.d/pop3 file :

#%PAM-1.0
auth       required     /lib/security/pam_pwdb.so debug shadow nullok

can anyone give any hints on this ?

--quay