I would just reiterate that faxes and e-mails are inherently more traceable than postal mail or even in-person delivery of the application (none of which require an ID). Everyone knows that in-person (non-absentee) voting has the most safeguards; that's not in dispute.

Unfortunately, the fraud potentially perpetrated by individuals or groups doesn't depend on submission method in this case. If people choose to fill out false request forms, they will get those forms to the clerk one way or another. The hard part is filling out the form, which (again) doesn't depend on submission method.