When you log into the system, your job is  set  to  enable  other
users  to  talk to you.  (See "help talk".) You can prevent other
users from talking to you by typing:

& messages n
messages now refused

To reenable messages, type:

& messages y
messages now accepted

Messages without any argument will reverse the current  state  of
acceptance/denial, and tell you the result:

& messages
messages now refused
