[Dovecot] Permission denied after dist-upgrade

[Thomas Skowron]

Hello,

after I have done a dist-upgrade to Squeeze, I got some nasty problem with my dovecot.
When I try to establish a connection via IMAP, it doesn't react and writes the following into my logfile:

2011-02-16 15:23:49 imap-login: Info: Login: user=<thomas at XXX>, method=PLAIN, rip=84.130.16.134, lip=XX.XXX.XX.XXX, TLS
2011-02-16 14:23:49 dovecot: Fatal: chdir(/home/vmail/XXX/thomas/) failed: Permission denied (euid=5000(<unknown>) egid=5000(<unknown>) stat() failed: No such file or directory)
2011-02-16 15:23:49 dovecot: Error: child 14493 (imap) returned error 89 (Fatal failure)

dovecot -n:
# 1.2.15: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.26-2-xen-amd64 x86_64 Debian 6.0 ext3
log_path: /home/vmail/dovecot-info.log
log_timestamp: %Y-%m-%d %H:%M:%S 
protocols: imap imaps pop3 pop3s
ssl_ca_file: /etc/ssl/certs/sub.class1.server.ca.pem
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
mail_privileged_group: vmail
mail_uid: vmail
mail_gid: vmail
mail_location: maildir:/home/vmail/%d/%n/
mbox_write_locks: fcntl dotlock
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
namespace:
 type: private
 separator: .
 prefix: INBOX.
 inbox: yes
 list: yes
 subscriptions: yes
lda:
 log_path: /home/vmail/dovecot-deliver.log
 postmaster_address: postmaster at XXX
 auth_socket_path: /var/run/dovecot/auth-master
 global_script_path: /home/vmail/globalsieverc
auth default:
 mechanisms: plain login
 passdb:
   driver: pam
 passdb:
   driver: sql
   args: /etc/dovecot/dovecot-sql.conf
 userdb:
   driver: passwd
 userdb:
   driver: static
   args: uid=vmail gid=vmail home=/home/vmail/%d/%n allow_all_users=yes
 socket:
   type: listen
   client:
     path: /var/run/dovecot/auth-client
     mode: 432
     user: postfix
     group: postfix
   master:
     path: /var/run/dovecot/auth-master
     mode: 384
     user: vmail

I tried to change privileges for /home/vmail/, didn't work. What makes me wonder is the <unknown>-label after euid=5000.
Anyone an idea how to fix that problem?

Thomas