See https://monero.town/post/968066

Onion http://rurcblzhmdk22kttfkel2zduhyu3r6to7knyc7wiorzrx5gw4c3lftad.onion/

This free email provider is not for everyone. Sometimes a Cockmail address is not accepted to register something. Sometimes, though not often, another email provider may indiscriminately block email from Cock.li. Afaik Cock.li<->Proton, Cock.li<->Tuta work.

PS: Admin, Vincent Canfield @vc@shitposter.club