I've used Mailman for several years now without any complaints (as a list administrator). The newer version, which DH uses, includes an amazing number of list administration e-mail addresses in the header of every message.
I'm kinda guessing that's for the benefit of the Webless subscribers. However, it takes up a huge bit of landscape in an individual's mail-reader window...the message starts somewhere around 1/3 to 1/2 of the way down the screen.
Does anyone know a way to turn OFF the headers if, as in the case of DH shared hosting, we don't have access to the Mailman script?