POP3 Authentication methods

[Nathan Ridge]

using qpopper, cucipop or any other decent POP3 program, does anyone know of
a way to authenticate to another machine?? i have been told that qpopper can
be set to authenticate to a radius server, is this possible does anyone
know, and have looked into cucipop using libpam and ldap but had no luck
there either.  any help much appreciated.