[Dovecot] Timeout while waiting for lock for transaction log file

I have a user that gets client timeout errors when he tries to delete/clean up his massive "Spam" folder (many thousands of mail messages).

He uses Thunderbird and has it configured to use "Move to Trash" when he deletes messages.

I find the following in Dovecot's log file when it happens:

Aug 28 10:38:22 ifm.liu.se dovecot: [ID 107833 mail.error] IMAP(bpn): Timeout while waiting for lock for transaction log file /home/bpn/Maildir/.Trash/dovecot.index.log

Aug 28 10:38:24 ifm.liu.se dovecot: [ID 107833 mail.info] IMAP(bpn): Disconnected

Any suggestions on what I can tuned/fix in Dovecot to solve this issue?

We're using Dovecot 1.0.3 with Maildirs.

This is the only user (so far) where we are seeing this.

• Peter