From the welcoming post:

All  commands  must  be sent  to  the "LISTSERV  address," 
[log in to unmask] from the address by which you are subscribed.

This  list is  available  in digest  form.  If you  wish  to receive  the 
digested  version of  the  postings,  just issue  a  SET HISTARCH  DIGEST 
command.

More  information on  LISTSERV  commands  can be  found  in the  LISTSERV 
reference  card, which  you can  retrieve  by sending  an "INFO  REFCARD" 
command to [log in to unmask]

Robert Marcom
Site Supervisor
Yates Community Archaeology Project
Rutherford B. H. Yates Museum
Houston, Texas