[Dovecot] Catch22: user needs space to fix out of space condition

[Joseph Tam]

A mail user reported that he filled up his INBOX (despite reminders he
was approaching his filesystem quota), and furthermore, he could not
fix the situation because he couldn't expunge message he marked for
deletion.

The dovecot logs revealed the cause

 	dovecot: imap(user): Error: open(/var/mail/user.lock) failed:
 		Disc quota exceeded

This created an impasse where a user cannot free space because he needs
to create a lock file that cannot be created because he needs free
space.  Is there any way out of this without administrator intervention?

Joseph Tam <jtam.home at gmail.com>