[X4U] What's this "Delivered" folder in Mail

[Crandon David]

Hello everyone,

I'm running 10.3.9.

Today, after launching Mail, I had, in my list of maiboxes, a new one 
called "Delivered". It has nothing in it. I don't know how it appeared 
there. I remember when I first started using Mail a couple of years ago 
the same thing happened. I don't remember back then though how I got 
rid of it or if it just disappeared or whatever.

Anyway, does anyone else have this folder? Anyone know what it is?

David