This should be a pretty basic feature, just not having a private message be there anymore. But for some reason that does not work here?
I tried searching for this. I found a year old open issue on GitHub and some reddit users complaining about this very issue
If you send personal data to a mailing list with hundreds of members, can you ask them to delete that email?
Email receivers get a copy of the email, in a similar fashion to Lemmy.
Also, the latest Lemmy version allows for local communities, where content does not federate