delete cached unticked/undormant articles?

[Seth Delackner <seth@jtan.com>]

In an old google post I found the following, which explains why I have
been unable to get rid of cached IMAP articles.  When you "expire" or
"delete" articles, this deletes the server copy of the article.  But
cached articles are never deleted unless you explicitly remove them
from the cache ala M-*.  While I can imagine some reason for this, how
do I both:

- cache all articles that are on the server
- cause B C-M-e (delete all expirable articles) to actually delete the
server AND cached copy of an article?

The default caching policy makes sense for ephemeral messages on NNTP
groups, but IMAP is persistant so it makes no sense to cache an
article that you have deleted on the server.

Lars Magne Ingebrigtsen (larsi@ifi.uio.no) wrote on 1996/09/25: (bless google):
> Joe Marzot <gmarzot@baynetworks.com> writes:
> > I think my confusion is between the word persistent and un-expirable.
> > 
> > apparently these are not synonymous.
> 
> They are not only not synonymous, they are orthogonal.
> 
> If you tap `*' on an article, you have made it persistent.  Nothing
> you ever do, except using the `M-*' command, will remove it from the
> cache where it's stored.
> 
> If you mark an article with the "E" mark, (ie., made it expirable), it
> will be deleted by the mail backend when it reaches a certain age.
> The persistent copy of the message will not be touched.
> 
> The two terms are not related.