[Dovecot] why dovecot try to access the uses's home?

[Farkas Levente]

hi,
after i try to use dovecot with ldap i configure dovecot as:
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first_valid_uid = 499
last_valid_uid = 499
first_valid_gid = 499
last_valid_gid = 499
default_mail_env = maildir:/home/mail/%d/%n
auth_userdb = static uid=499 gid=499 home=/home/users/%d/%n
auth_passdb = ldap /etc/dovecot-ldap.conf
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but after this i've got the error in imap.log:
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dovecot: Dec 29 14:39:14 Fatal: chdir(/home/users/<username>) failed 
with uid 499: Permission denied
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i see the reason since each user has it's own uid and uid 499 can't 
access to the users home which has 0700 access right. but why dovecot 
would like to access the user's home? does it nessesary? since in this 
case one static uid can be usable or this uid has to be read (write?) 
access to all user's home. is there any usage of static uid in this case?
yours.

-- 
   Levente                               "Si vis pacem para bellum!"