I honestly have no idea if this is even possible, but... it would be great to be able to retroactively change emails sent from a specific address.

Potential use case: I send an email, but accidentally send it from my main email address and not my alias. I would like to, upon reply back to the recipient, change the "from" email address to my alias (which is currently possible), but then be able to retroactively go back and change which email address sent the initial email.

Again, no idea if this is even technically possible.