It would be nice if you could compose email in bugzilla in response to a bug report with: From: Matthew Wilson <bugzilla> Subject: BUG ID#xxx Then when the bug reporter replies, the reply would get appended to the bug report. Jitterbug does this quite nicely.
The mail handling has been updated to save out any replies to bugzilla mail to a directory until the ability to import it into the database has been written (we are accepting patches). If you wish to send mail as bugzilla, adding a comment and leaving the ticket in the same state will accomplish the other half.