Whaaaaaaat
So you can whitelist/blacklist, or is it a blanket thing? That wouldn't work for me.
Can't find info on the email service though
nostr:npub1n0delesspp5qyp9sd6d4fql9g3s96k7g4yyvfmpdncpp542wvxzqksp427 has this feature. I tested by sending an email to thebullishbitcoiner@nodeless.io and received an email response with the following invoice. The minimum paywall is 1000 sats.
You can check it out here:
https://nodeless.io/?ref=b42efe7e-7efb-47ec-b2dc-3421f24f331f 
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