Earlier quoted context omitted.
You can’t unsend an email because you can’t force someone else to delete something. Emails end up as files on someone else’s server. Claiming this is a UX issue is intentionally missing the point. If this is legitimately a foreign concept to you, an afternoon setting up postfix and playing around with it might be worth your time. Email is a protocol, not a program. A “delete” request would be just that, a request. Yo…
Thanks for the explanation, but I ran mail servers for ~25 years. I am familiar with the technology, and in the mid-90s even wrote a chapter of a book explaining email. And I've been using version control even longer. Maybe try rereading what I wrote without the assumption that it comes from ignorance.
Without trying to be snarky - All your comments directly ignore that what you're proposing values one stakeholder more highly than another.
People keep pointing out that there are two users involved in this exchange, and they both weigh equally, and you dismiss them and talk about running mail servers 25 years ago (who cares?).
You keep saying "I should be able to unsend my email". Let me rephrase your question - Why should you be allowed to delete my email?