[Dovecot] How to configure auth_userdb and auth_passwd?

Hi!

i want to configure dovecot to use a modified passwdfile. A linie in this file looks like this: "username: <TAB> crypted_password"

how i have to use the auth_userdb and auth_passwd command? Now i have: auth_userdb = passwd-file /path/file auth_passwd = passwd-file /path/file (same file)

dovecot is starting normaly (i think) but a authentification test via telnet doesnt work.

Any suggestions? Thanx a lot. Mirko