Thanks for the review, Vijay.

> - Section 5: "... in an expensive search of tens of thousands of
>   mailboxes." --- Is this true or a hyperbole for effect?  Do people
>   have tens of thousands of folders in an IMAP account (I believe
>   the term "mailbox" equates to a folder).  I guess modern operating
>   system allow millions of inodes (or their equivalent) on a
>   filesystem, so technically you may be correct, of course.  I
>   was just curious if operationally this is the case.

It's not hyperbole.  There have been IMAP servers that exposed tens of
thousands of Usenet newsgroups as shared IMAP mailboxes.  I think it's
unlikely (though possible) that any personal namespaces have tens of
thousands of private mailboxes, but it's easily possible for a
"subtree" search to hit that many in a situation such as this.

Barry
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