...
You should see the tests BOUNCE_MESSAGE and ANY_BOUNCE_MESSAGE appearing in the "Content analysis details" section.
56. Restart spamd, as usual, so that the ruleset is loaded.
7. Edit your procmailrc (or similar) to move messages that contain "ANY_BOUNCE_MESSAGE" in the "X-Spam-Status" header, to a "bounces" folder.
Don't forget – once SpamAssassin 3.2.0 is released, you may need to delete VBounce.pm and 20_vbounce.cf from /etc/mail/spamassassin, so that it doesn't clash with the released version.