extern DRIVER mboxdriver; extern DRIVER imapdriver; extern DRIVER nntpdriver; extern DRIVER pop3driver; extern DRIVER mixdriver; extern DRIVER mxdriver; extern DRIVER mbxdriver; extern DRIVER tenexdriver; extern DRIVER mtxdriver; extern DRIVER mhdriver; extern DRIVER mmdfdriver; extern DRIVER unixdriver; extern DRIVER newsdriver; extern DRIVER philedriver; extern DRIVER dummydriver; extern AUTHENTICATOR auth_gss; extern AUTHENTICATOR auth_ext; extern AUTHENTICATOR auth_md5; extern AUTHENTICATOR auth_pla; extern AUTHENTICATOR auth_log;