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I'd suggest not software at all.

Yes, pen & paper ftw. Get some stamps and envelopes too, then start playing chess via correspondence.

lichess.org would be my pick. Awesome software

Might as well bring back play-by-post Dungeons & Dragons while we're at it.

I know it's still going in a more modern capacity on myth-weavers.com and other sites, but I miss the mail version, chore that it was.