On Tue, 24 Sep 2002 17:06:23 +0200, Simon Josefsson wrote: > > By the way, even a UID only client could avoid the problem if it paid > > attention to the EXISTS value. > No, the mailbox can become empty before the client received the EXISTS > value. Returning BAD in this case seems unwarranted.
That is impossible, by definition in IMAP. If the fact that a message exists has been announced by EXISTS, that fact can not be revoked except via an untagged EXPUNGE. The client always knows, at all times, how many messages there are. The server may desire to empty a mailbox, but it can not do so until the EXPUNGE has been announced.
