yes, fair enough. even without the 2 way obfuscation, I'd still pay for this.

craigslist implements something like this now. If you email a CL anonymized email address and email back and forth, you never get the counterparty's email address.

Basically craigslist just acts as a relay, so all communication actually happens between $PERSON_A and Craigslist and separately between $PERSON_B and Craigslist.