I turned on lazy_expunge and configured a namespace following the wiki[0] instructions for mdbox configuration:

namespace {
inbox = yes
location = prefix = separator = . } namespace { hidden = yes inbox = no list = no location = prefix = INBOX. separator = . } namespace { location = mdbox:~/mdbox:MAILBOXDIR=expunged prefix = EXPUNGED. separator = . }

This created an EXPUNGED mailbox in my client (thunderbird), which was greyed out. When I deleted things, they got put in the EXPUNGED mailbox, as expected, but I could not access them to try and "restore" them. The server would say that the mailbox did not exist.

micah

0. http://wiki2.dovecot.org/Plugins/Lazyexpunge