proxy POP3/IMAP server?

[Ramesh Panuganty]

Hi All,

Does anyone know whether there are any proxy POP3/IMAP servers 
available for trying or looking into the code? I basically want a server
which accepts requests like
        login: user@mailer
        pass: <password on mailer>
and just forwards the data between the user and the actual mail 
server and doesn't maintain any accounts on itself.

Any help is greatly appreciated.

Regards,
Ramesh