The upcoming update to Gmail would possibly come with a function which might permit customers to ship emails that expire after a user-defined period of time. From a document: Working on an e mail provider is onerous as you must be suitable with all types of e mail suppliers and e mail shoppers. But it does not appear to be preventing Google as the corporate is now evolving past the easy POP3/IMAP/SMTP protocols. Based on the ones screenshots, expiring emails paintings beautiful just like expiring emails in ProtonMail. After a while, the e-mail turns into unreadable. In the compose display screen, there is a tiny lock icon referred to as “confidential mode.” It says that the recipient will be unable to ahead e mail content material, replica and paste, obtain or print the e-mail.