Recently, C&CZ worked on DNS based techniques that can be used to fight spam, phishing and eavesdropping of mail. Of the list of mandatory open standards of the [ Pas-Toe-of-Leg-Uit] list w.r.t. email, C&CZ implemented SPF a while ago. Because strict implementation [ breaks simple/automatic forwarding], SPF has not been implemented in a strict manner. Also STARTTLS for mail encryption has been implemented a while ago. Recently, we introduced [ DANE] and DMARC, which makes it possible to start with DKIM.