Bugzilla had a few places where it should've used Param('emailsuffix'). We use email suffices in our Bugzilla installation so I spotted the problem. I'll attach a patch to fix these problems.
Oops, patch has an error in it. Will attach a new one.
committed to trunk
Sorry for the spam, but I needed to be able to query for all of these correctly.
Moving closed bugs to Bugzilla product