dovecot - Sep 2006 - imposible authenticate dovecot, but authtest and testsaslauthd can

Hi all, Im new and have a problem,

With authtest, i have Authentication

[root at dc9f8f585 ~]# authtest esimon at example.tld
Authentication succeeded.

     Authenticated: esimon at example.tld  (uid 501, gid 501)
    Home Directory: /home/vmail/domains/
           Maildir: (none)
             Quota: (none)
Encrypted Password: (none)
Cleartext Password: (none)
           Options: (none)


With testsaslauthd, i have Authentication

[root at dc9f8f585 ~]# testsaslauthd -u esimon at example.tld -p edu+123*
0: OK "Success."

But wen try with dovecot, the logs say

Sep 21 13:51:31 dc9f8f585 dovecot-auth: ldap(esimon at example.tld): No
password in reply
Sep 21 13:51:31 dc9f8f585 imap-login: Aborted login [::ffff:127.0.0.1]
Sep 21 13:51:31 dc9f8f585 dovecot-auth: Login process 7 disconnected
Sep 21 13:51:31 dc9f8f585 dovecot-auth: Login process 7 connected
Sep 21 13:51:31 dc9f8f585 dovecot-auth: Login process 7 sent handshake: PID
3379

Why dovecot need the Password?
there is some way for only authenticate?

i using,
[root at dc9f8f585 ~]# rpm -qa dovecot
dovecot-0.99.11-2.EL4.1

And the authentication is against Active Directory


Thanks for any help.
NewZen.
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