https://git-send-email.io is a good resource, but it can be as simple as:

git format-patch HEAD

And sending it over any medium you want (signal, etc)

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OK, I get it. How then would replies to a patch denote line of code they're discussing?

I don't understand

"Their root doesn't have to be a kind:1621 issue, but also a kind:1617 patch event."