nnagent doesn't handle expiry. Instead, there's a special
gnus-agent-expire command that will expire all read articles that
are older than gnus-agent-expire-days days. It can be run
whenever you feel that you're running out of space. It's not
particularly fast or efficient, and it's not a particularly good idea to
interrupt it (with C-g or anything else) once you've started it.
if gnus-agent-expire-all is non-nil, this command will
expire all articles--unread, read, ticked and dormant. If nil
(which is the default), only read articles are eligible for expiry, and
unread, ticked and dormant articles will be kept indefinitely.
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