Some related posts and discussions, here on SN:

https://thebitcoinmanual.com/articles/curb-email-spam-btc/

Jesse Powell's bitcoin-powered email spam control experiment (2015)

https://twitter.com/lopp/status/674145066454089728

Reacher - using the Strike API, Bitcoin and Lightning to fix email!

https://www.reacher.me/

Sam Walker on Reacher & Solving Email Spam with Lightning Payments

https://fountain.fm/episode/7999408548

bitcoin

Let's Integrate Lightning with a version of the email protocols

mcintosh

Some related posts and discussions, here on SN:

*Email spam prevention with lightning*
https://stacker.news/items/22625

*How To Curb Email Spam With Bitcoin*
https://stacker.news/items/26458
https://thebitcoinmanual.com/articles/curb-email-spam-btc/

*Jesse Powell's bitcoin-powered email spam control experiment (2015)*
https://stacker.news/items/15907
https://twitter.com/lopp/status/674145066454089728

*Reacher - using the Strike API, Bitcoin and Lightning to fix email!*
https://stacker.news/items/24812
https://www.reacher.me/

*Sam Walker on Reacher & Solving Email Spam with Lightning Payments*
https://stacker.news/items/25535
https://fountain.fm/episode/7999408548