There is a way to limit incoming DMs. Some posters don't accept them. I am not aware of any way for a Mod/Maude to shut off one's ability to DM outgoing.
Antone Smith, Derrick Griffin, Snoop Minnis, Jonathan Colon, Justin Flowe, Jadon Haselwood, Jason Marshall, Tyson Campbell, Patrick Surtain Jr, Andrew Chatfield, Jordan Cronkrite, Markeith Cooper, Brian Gibson, Orpheus Roye all coming.