It's about time for 's original vision for hashcash to be used as intended: to fight email spam. I'd welcome an email client which required a few satoshis to be paid over Lightning to deliver something to my inbox.
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Elephant Grass is an open-source Gmail script that requests Bitcoin payments from unknown email senders. If the sender pays you, their email makes it to your inbox. contributed.
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Hashcash email would be great but interoperability is the challenge. Some people actually tried to make a business out of an unnecessarily intermediated version of Elephant Grass. There are a number of problems which I laid out at Scaling Bitcoin in 2015: