I recently read a complaint about the opposite. Someone deleted their Proton account and their handle was made available 1 year later. They were rightfully angry because the next user would potentially start receiving mail from things like the original user’s bank. The new user could perform password resets on accounts where the original user had not yet changed the email address on file.
fwiw, here is an emacs version:
https://codeberg.org/martianh/lem.el#headline-11
I think what would be most useful would be a usenet→lemmy gateway, so that rich catalog of usenet clients can be leveraged on Lemmy.