The e-mail address match should include all addresses with a substring the same as that typed in by the bug editor. e.g. I always get firstname.lastname@example.org with email@example.com .
It currently does do a substring match... "vin.shar" will match me, for example. Are you saying that you want it to match "firstname.lastname@example.org" when you enter "email@example.com"? That would lead to pretty unpredictable results. Should "firstname.lastname@example.org" to match "email@example.com"? I think this is WONTFIX.
Yeah, it does do a substring match, currently. We won't mix it up so that it does something unpredictable like split the email address randomly and do some complicated search on it.
*** Bug 341740 has been marked as a duplicate of this bug. ***