[Dovecot] Too many open files

[bofh list]

dovecot: Nov 08 04:04:23 Error: IMAP(user): open() failed with file
mailstore/user/Maildir/.Alerts/dovecot.index.log.2: Too many open files
dovecot: Nov 08 04:04:23 Error: IMAP(user):
open(mailstore/user/Maildir/.Alerts/tmp/1162976663.P4853Q1817.server)
failed: Too many open files
dovecot: Nov 08 04:04:23 Error: IMAP(user): open() failed with file
mailstore/user/Maildir/dovecot.index.tmp: Too many open files

Seeing this with both 1.0beta9 and 1.0rc12

This occured when a user was not using the client, however the
client(Thunderbird) filtering mechanism was active as their client is left
on 24x7.

Do we really need to increase individual user maxfiles to >1024 ?  Dovecot
is set to 31768 so it is definately the user process here.

Anything I can tweak in dovecot.conf to prevent this?

Thanks!
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