autoexpunge clarification

[Michael Fox]

I'm trying to understand autoexpunge, but the documentation is just not
clear.  Hopefully, someone can clear up a few questions.

 

http://wiki.dovecot.org/MailboxSettings says the following:

 

autoexpunge=<time>: (v2.2.20+) Automatically at user deinitialization
expunge all mails in this mailbox whose saved-timestamp is older than <time>
(e.g. autoexpunge=30d). This removes the need for expire plugin
<http://wiki.dovecot.org/Plugins/Expire>  if you don't care that the
expunging may not always happen in time.

 

What does "at user deinitialization" mean?

 

What does "if you don't care that the expunging may not always happen in
time" mean?

 

I read the sub-bullets but they just aren't clear.  When exactly does
autoexpunge occur?

 

Thanks,

Michael