Hashcash fixes this?

Alas, that ship has long sailed.

nostr:nprofile1qqs0w2xeumnsfq6cuuynpaw2vjcfwacdnzwvmp59flnp3mdfez3czpspz9mhxue69uhkummnw3ezuamfdejj76l8lp0 has a good blog on this.

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Discussion

I used to add these to my email but gmail doesn’t look at them

Hashcash is still the answer to email spam. Gmail is a second order problem.

SMTP has been captured though.