(All of these additions should be visible if you enter MSG alone,
or in HELP MSG).

CMSG now can be used to clear out messages in a given folder,
including the inbox.

MSG MOVE FROM <sendername> [TO] <foldername>
Gets all the messages from a given sender and puts them in
the folder you specify.

Penned by my hand on the 10th of Miraman, in the year 425 AF.