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It doesn't have to be people. Have you considered using crabs? https://phys.org/news/2012-04-scientists-crab-powered.html

https://www.clicksend.com/post/concealed-pin-number-letters/ Unless you mean the requests were that hot off the presses it burns the mail carriers hands ;-)

I assume by safe for those handling them his main concerns for DNS via letter would be letter bombs and letters containing toxic substances such as anthrax powder or ricin.

That and I planned to put stickers and stuff in. Asking for return envelopes and addresses seems a little bit terrible :)

Oh I see, People mail in a DNS request and you return it.

> Asking for return envelopes and addresses seems a little bit terrible :)

How else you going to reply with the DNS Record? ;-)

EDIT: Also thanks for the DNS Via SMS service. I've already used it twice for legit reasons. Who would of thought that having an out of band DNS service would be handy.

Maybe the sender can just put the domain in the return address instead of their name. I don't know if the post office really gives a shit