We already send all manner of "explosives" thru the mail, you can get black powder thru the mail.
Same with gun powder construction fasteners that use the same amount of "explosive" material as a firearm round.
I can get 0.22 single shot construction bullets that will load in my rifle off Amazon right now.
https://www.amazon.com/Caliber-Yell...d=1&keywords=gun+powder&qid=1627779329&sr=8-8
Mail order firearm restrictions have nothing to with this spontaneous discharge delusion you have.
I support synergy between firearm and ballot registration, owning a fire arm is a right, voting is a right.
If you wouldn't give someone a gun without ID or mail it to them without any manner or control of verification involved, you shouldn't support giving them a ballot.