"With Bitcoin via Email, anyone using Proton Wallet can send you bitcoin or receive bitcoin from you using just an email address. This feature is available for all Proton Wallet users and can be used with Proton Mail emails, custom domain emails, or the external email used to create a Proton account. This eliminates the need to copy, share, or manage complex Bitcoin addresses."
https://proton.me/support/wallet-bitcoin-via-email
guess what !