Force them to learn the English language. Track them down, put them into solitary confinement for a few years and force them to learn their mother tongue!
No, I'm not referring to forcing English on any remote tribes, but on the people who write me unsolicited commercial emails like this one:
hi , Gia , here
You were resfersred to me as a person seeking finsancsial indepsendesnce. My misssion is to heslp everyone I possibly can achieve fisnancial susccess. $1s0,s000 in 4s5 - 9s0 days and restiremesnt in 3s-5 YEsARsS are wsithsin yosur resach.
I csan hselsp yosu get there. Regarsdless of your csurrent age or your dsebt load. This is a trsuly revsolutsionasry opportsunity,not an MsLM or frsanchissse.
Plsease taske the fsirst step to finasncial freesdom. al@xyz.com was the addsress refserred to me for this opsportunsity.
I would have thought that the first thing to be able to gain independence and financial freedom, thus enabling an early retirement would be the ability to write!
It looks more like a communicable disease than a language. Spammers are obviously Internet savvy, but if that is all that they can muster, then they deserve to be locked up.

