[exim] SSL forcing

ow can I force e-mail from the Internet At large to be only accepted
if and only if done by SSL/TLS methods?

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Member - Liberal International This is doctor@@nl2k.ab.ca Ici doctor@@nl2k.ab.ca
Yahweh, Queen & country!Never Satan President Republic!Beware AntiChrist rising!
https://www.empire.kred/ROOTNK?t=94a1f39b Look at Psalms 14 and 53 on Atheism
Australia avoiding voting for any Republican Candidates on 19 May 2019