Error in Dovecot

[mentes]

I have an error.

dovecot: dovecot: Fatal: chdir(/var/vmail/domain.com/user/) failed: Permission denied (euid=5000() egid=5000() missing +x perm: /var/vmail/domain.com)
dovecot: dovecot: child 22766 (imap) returned error 89 (Fatal failure)

I do:

chmod +x /var/vmail/domain.com/user
chown -R vmail:vmail /var/vmail

And I still have the same error.

root@server:/var/vmail# ls -al
total 24
drwxr-xr-x  4 vmail vmail 4096 Aug  3 12:27 .
drwxr-xr-x 16 root  root  4096 Aug  3 00:30 ..
-rw-------  1 vmail vmail 1382 Aug  3 12:34 .mailfilter
-rw-r--r--  1 vmail vmail 1382 Aug  3 12:34 .mailfilter~
drwxr-xr-x  2 vmail vmail 4096 Aug  2 12:26 mailfilters
drwx------  3 vmail vmail 4096 Aug  3 12:27 domain.com

root@server:/var/vmail/domain.com# ls -al
total 12
drwx------ 3 vmail vmail 4096 Aug  3 12:27 .
drwxr-xr-x 4 vmail vmail 4096 Aug  3 12:27 ..
drwx--x--x 3 vmail vmail 4096 Aug  3 12:27 user

root@server:/var/vmail/domain.com/user# ls -al
total 16
drwx--x--x 3 vmail vmail 4096 Aug  3 12:27 .
drwx------ 3 vmail vmail 4096 Aug  3 12:27 ..
drwx--x--x 9 vmail vmail 4096 Aug  3 12:27 Maildir
-rw-r--r-- 1 vmail vmail   48 Aug  3 12:27 .sieve

root@server:~# dpkg -l | grep dovecot
ii  dovecot-common                      1:1.2.15-7                   secure mail server that supports mbox and maildir mailboxes
ii  dovecot-imapd                       1:1.2.15-7                   secure IMAP server that supports mbox and maildir mailboxes
ii  dovecot-pop3d                       1:1.2.15-7                   secure POP3 server that supports mbox and maildir mailboxes

ISPconfig 3.0.3.3
Debian 6.0.2