Hashcash fixes this?
Alas, that ship has long sailed.
nostr:nprofile1qqs0w2xeumnsfq6cuuynpaw2vjcfwacdnzwvmp59flnp3mdfez3czpspz9mhxue69uhkummnw3ezuamfdejj76l8lp0 has a good blog on this.
I used to add these to my email but gmail doesn’t look at them
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Useful tool:
https://easydmarc.com/
Hashcash is still the answer to email spam. Gmail is a second order problem.
SMTP has been captured though.
