This is a Gmail-specific feature. I'd guess it's there for user convenience and some protection against typos (accidental or malicious). https://support.google

This is a Gmail-specific feature. I'd guess it's there for user convenience and some protection against typos (accidental or malicious). https://support.google.com/mail/answer/7436150?hl=en https://support.google.com/mail/answer/7436150?hl=en