I wish I could send a one-time link to my father where we could play chess against each other by re-visiting the same link.
The e-mail part made me think of this. I have no use for an e-mail based chat but an online chess game that's easy to use without registration would be cool. He's 82 and he can't use complex sites.
well then deltachat is exactly what you want because it supports webxdc apps which can run in the deltachat client. here is the chess app: https://webxdc.org/apps/#arcanecircle-chess
The e-mail part made me think of this. I have no use for an e-mail based chat but an online chess game that's easy to use without registration would be cool. He's 82 and he can't use complex sites.