[Dovecot] imap + unmounted home disk

[T. Horsnell]

dovecot 0.99 still (RHEL4), I'm sorry to say.
The config is for mbox's to live on the user's home disk.
If the user tries to make an imap connection when
his home disk is unmounted, various permission denied
messages are logged, as expected, but then the imap 
process seems to hang around instead of aborting.
The result is that eventually the imap process
limit is reached, and even those users whose home
disks are correctly mounted, cant get at their mail.

Apologies if this has already been fixed - I cant
find anything relevant in the archives.

Cheers,
Terry