Ens, what is the mail?

This email refers to the email sent by using the Ethereum name service.

NS is a decentralized domain name system, which allows users to use domain names on the Ethereum blockchain instead of complex Ethereum addresses.

With ENS, users can associate their Ethernet address with an easy-to-remember domain name, such as "yourname.eth", and then use this domain name to send and receive emails. ENS mail works in a similar way to traditional e-mail, except that the ENS domain name is used as the recipient address instead of the Ethereum address.