> If the history of email had gone somewhat differently, the last email you sent could have been rescinded or superseded by a newer version when you accidentally wrote the wrong thing. It could have auto-destructed if not read by midnight.

Immutability is one of the best things about email.

As a platform for sending invoices and official communications it’s fine. As a way for people to talk with each other it sucks. These days I’m of the opinion that most messaging should just be auto deleted after a month. If there’s something particularly important you want to keep, note it down. Otherwise just let it be forgotten.

Certainly it should be immutable if read.