DELAYED DELETE and very long mailboxes => segfault

[Bron Gondwana]

On Fri, Feb 06, 2009 at 12:27:48PM -0500, Brian Awood wrote:
> We have had users that weren't able to delete a mailbox that was close 
> to, or already at, the max name length.  Cyrus generates the new name 
> with the DELETED prefix and time stamp suffix, which ends up being 
> longer than the allowed max and the rename then fails.
> 
> No idea where 490 came from, but it seems like most imap clients don't 
> even correctly display a mailbox name that long.  Also, the mailboxes 
> we've seen like this look like they occurred by accident, whether 
> because of user error or software bug, the user then can't delete the 
> mailbox themselves.  

Well, an alternative is to shorten the allowed name and leave
MAX_MAILBOX_NAME as it is :)  There are only a couple of places
where mailbox name lengths are checked explicitly, and we can
change those easily enough.

Anyone have an opinon on a good length limit? 

( yes, ours have all been INBOX.INBOX.INBOX.INBOX.INBOX.....INBOX.Foo )

Bron.