Reply to the texts with "dick pics"...but of horse or cow penis. Chances are pretty good he will block you or just stop soon after the first.
For email...auto reply with links to https://en.wikipedia.org/wiki/Goatse.cx
or go for the the rabbit hole and toss out a random OnlyFans /Ashley Madison / Grinder page.
Now that you have made it clear that humans will see each message get ready for a torrent of penis photos. Some times I feel bad for the mechanical turkers.
Granted, I don't understand the psychology of people who send dick pics so I could be wrong about this, but I get the impression it's not a deeply considered thing conducive to spending lots of effort on. Adversarial dick pics are probably a rare threat just because most men won't be bothered.
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