[Dovecot] ldap login with userid

[spamvoll at googlemail.com]

hi..

Dovecot Version 1.2.9

im trying to login to dovecot with my ldap uid.

currently im using:
user_attrs = homeDirectory=home,uid=mail=maildir:/mail/%$
user_filter = (&(objectClass=gosaMailAccount)(|(mail=%u)(gosaMailAlternateAddress=%u)))
to match the mailaddress and deliver the mail to the users homdir
(/mail/uid_of_the_user)

But i cant login to dovecot:
pass_attrs = uid=user,userPassword=password
pass_filter = (&(objectClass=gosaMailAccount)(uid=%u))

the Log:
Jan 22 17:21:51 testimap dovecot: auth(default): client in:
AUTH	1	PLAIN	service=imap	secured	lip=10.0.0.15	rip=10.0.0.20	lport=993	rport=36879
Jan 22 17:21:51 testimap dovecot: auth(default): client out: CONT	1	
Jan 22 17:21:51 testimap dovecot: auth(default): client in:
CONT	1	AG1zbWlhdGVrAHRpYWFrdGVuZXI=
Jan 22 17:21:51 testimap dovecot: auth(default):
ldap(myuser,10.0.0.20): bind search: base=dc=example,dc=com
filter=(&(objectClass=gosaMailAccount)(uid=myuser))
Jan 22 17:21:51 testimap dovecot: auth(default):
ldap(myuser,10.0.0.20): result: uid(user)=myuser
Jan 22 17:21:51 testimap dovecot: auth(default): client out: OK	1	user=myuser
Jan 22 17:21:51 testimap dovecot: auth(default): master in: REQUEST	1	2541	1
Jan 22 17:21:51 testimap dovecot: auth(default):
passwd(myuser,10.0.0.20): lookup
Jan 22 17:21:51 testimap dovecot: auth(default):
passwd(myuser,10.0.0.20): unknown user
Jan 22 17:21:51 testimap dovecot: auth(default):
ldap(myuser,10.0.0.20): user search: base=dc=example,dc=com
scope=subtree filter=(&(objectClass=gosaMailAccount)(|(mail=myuser)(gosaMailAlternateAddress=myuser)))
fields=homeDirectory,uid
Jan 22 17:21:51 testimap dovecot: auth(default):
ldap(myuser,10.0.0.20): Unknown user
Jan 22 17:21:51 testimap dovecot: auth(default):
userdb(myuser,10.0.0.20): user not found from any userdbs
Jan 22 17:21:51 testimap dovecot: auth(default): master out: NOTFOUND	1
Jan 22 17:21:51 testimap dovecot: imap-login: Internal login failure
(auth failed, 1 attempts): user=<myuser>, method=PLAIN, rip=10.0.0.20,
lip=10.0.0.15, TLS

any ideas ?