Auro expunge

[@lbutlr]

When using autoexpunge = 14 days in, for example. The trash of junk folders, does that physically remove the messages from disk or simply mark them to be removed and some other action needs to be taken?

I ask because my mail server crapped out today and I discovered a Junk folder with 490,000 messages in it, and the sa-spamd and mariadb processes died a horrible death.

Haven't had time to track down what was going on, but there were definitely messages in that junk folder from 2019 (though, of course, they may have been added within the last 14 days, I can't verify that as my solution was to remove the folder and recreate a new empty maildir).

-- 
I don't believe there's a power in the 'verse can stop Kaylee from
	bein' cheerful. Sometimes you just wanna duct-tape her mouth and
	dump her in the hold for a month.