Refer to the Listowner documentation, it is described in section 9, templates.
Perform a get Listname mailtpl. If this fails it indicates that you are using
the default template. Therefore, request default mailtpl.
Make your changes, under section (TOP_BANNER), toward the bottom. Put it back
as:
Listname mailtpl
Michael W. Jones ([log in to unmask])
One of the Celiac LISTSERV Co-Owners ([log in to unmask])