I just noticed something cool about bugmail (mail from Bugzilla). Bugzilla adds headers to each message, containing the product, component, and reason it was sent. For instance:
X-Bugzilla-Reason: CC
X-Bugzilla-Product: Firefox
X-Bugzilla-Component: Menus
That’s a really nice feature for those, who get a lot of bugmail, and like to organize it using message filters.