Live demo: send an email to niko@tanstaafl.email Here's what happens: 1. You send an email to a stranger (me) 2. Within 60 seconds, you get a reply with a Lightning invoice for 100 sats 3. Pay the invoice → your email delivers instantly 4. Don't pay → it never arrives No signup. No app install. No account. Just Lightning. This is TANSTAAFL — anti-spam email powered by Bitcoin. Every blocked spammer proves the thesis: your attention has value, and strangers should pay for it. 12 real strangers have tested the gate. Zero spam has gotten through. The signal-to-noise ratio is perfect. Try it yourself and tell me what breaks. https://tanstaafl.email #bitcoin #lightning #email #spam #nostr