Feature request

Feature description
Doing the command /mail delete <mail number> would be useful if you want to delete just one message instead of clearing all your mail. This way you can have a cleaner inbox but keep the things you want to keep for a bit longer.

How the feature is useful
You won't have to go into the user's userdata file just do clear up some mail and they can do it themselves.

Could also be /mail read to "mark it as read" but that might be something else or get confused

Duplicate of #3097.

Whoops didn't see that dupe, would be great if GitHub search properly worked

It do be like that honestly

Yeah this is basically waiting on someone willing to redo the mail system and replace it with something more flexible.