Thanks for the super quick reply!

Dovecot -n:

# 1.2.25: /etc/dovecot/dovecot.conf # OS: Linux 2.6.30-ARCH x86_64
log_path: /var/log/dovecot info_log_path: /var/log/dovecot.info protocols: imap disable_plaintext_auth: no login_dir: /var/run/dovecot/login login_executable: /usr/lib/dovecot/imap-login first_valid_uid: 999 last_valid_uid: 9999 last_valid_gid: 9999 mail_location: maildir:~/.mail/Maildir mail_full_filesystem_access: yes mmap_disable: yes mail_nfs_storage: yes mail_nfs_index: yes lock_method: dotlock maildir_copy_preserve_filename: yes auth default: passdb: driver: pam userdb: driver: passwd

Am Freitag, den 02.10.2009, 21:04 +0800 schrieb Carlos Candeias:

Regardless of the mail client no user can modify, move, delete or subscribe an imap folder with Dovecot >1.2.1 (meanwhile 1.2.5). Dovecot apparently have some dotlock problems: (From dovecot.log) Oct 02 14:58:19 IMAP(jcci): Error: fchown(/candeias/home/jcci/.mail/Maildir/subscriptions.lock, -1, 0(root)) failed: Operation not permitted (egid=1003(management), group based on /candeias/home/jcci/.mail/Maildir) Oct 02 14:58:19 IMAP(jcci): Error: file_dotlock_open() failed with subscription file /candeias/home/jcci/.mail/Maildir/subscriptions: Operation not permitted Oct 02 14:58:20 IMAP(jcci): Error: fchown(/candeias/home/jcci/.mail/Maildir/subscriptions.lock, -1, 0(root)) failed: Operation not permitted (egid=1003(management), group based on /candeias/home/jcci/.mail/Maildir) Oct 02 14:58:20 IMAP(jcci): Error: file_dotlock_open() failed with subscription file /candeias/home/jcci/.mail/Maildir/subscriptions: Operation not permitted Oct 02 14:58:20 IMAP(jcci): Error: fchown(/candeias/home/jcci/.mail/Maildir/subscriptions.lock, -1, 0(root)) failed: Operation not permitted (egid=1003(management), group based on /candeias/home/jcci/.mail/Maildir) Oct 02 14:58:20 IMAP(jcci): Error: file_dotlock_open() failed with subscription file /candeias/home/jcci/.mail/Maildir/subscriptions: Operation not permitted Oct 02 14:58:21 IMAP(jcci): Error: fchown(/candeias/home/jcci/.mail/Maildir/subscriptions.lock, -1, 0(root)) failed: Operation not permitted (egid=1003(management), group based on /candeias/home/jcci/.mail/Maildir) Oct 02 14:58:21 IMAP(jcci): Error: file_dotlock_open() failed with subscription file /candeias/home/jcci/.mail/Maildir/subscriptions: Operation not permitted Oct 02 14:58:21 IMAP(jcci): Error: fchown(/candeias/home/jcci/.mail/Maildir/subscriptions.lock, -1, 0(root)) failed: Operation not permitted (egid=1003(management), group based on /candeias/home/jcci/.mail/Maildir) Oct 02 14:58:21 IMAP(jcci): Error: file_dotlock_open() failed with subscription file /candeias/home/jcci/.mail/Maildir/subscriptions: Operation not permitted

This was an attemt of changing a subscription. Another weird point: I can create an IMAP folder although it does not show up in the folder list. But the new folder is in the subscription list, just marked as unsubscribed and there is no way to change that. This problem is safely reproducible and I wonder whether I should be really the only person having this trouble. I'm using MAILDIR and simple plain test authentification (internal mail server). The location is mail_location: maildir:~/.mail/Maildir which means a subfolder in each user's home directory. All homes are exported to NFS, but the Dovecot is just on the same server and thus accesses locally. Downgrade to version 1.1.17 solves all problems. Archlinux x86_64, Linux 2.6.30 It would be really great if somebody could understand the cause and suggest a solution!