[Dovecot] Auth user from sasldb with dovecot

[kami Nonstop]

Hi I configured my postfix that i can access the file /etc/sasl2/sasldb2
and authorize the users how are added in this database.
My smtpd.conf looks like this:

mech_list: PLAIN LOGIN
pwcheck_method: auxprop
auxprop_plugin: sasldb

My saslauthd is not running. And when i telnet to port 25 i can
authorize my self like this:

telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 localhost ESMTP Postfix
ehlo localhost
250-localhost
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250 8BITMIME
auth plain dGVzdEBtaWNyb3NlcnZ==
235 Authentication successful


But my problem is now that i dont know how to configure dovecot that i
can login to my system with squirrelmail or something else? Dovecot
should use the user added in sasldb2.

I read this Howto but can find a solution for this:

http://postfix.hostingzero.com/SASL_README.html

I hope someone here can help me?

Thx a lot

Cu kami