Using_Servers

   Commands directed to a mail server take the form of a mail
   message addressed to

   mailserv@mail-server-host

   where MAIL-SERVER-HOST is the host name of the machine running
   the mail server. You need to obtain this name from your system
   manager. The text of the message contains mail server commands,
   one command per line.

   For example, suppose the address of a mail server is
   mailserv@example.com. To obtain a help message from the server
   as well as a list of the available files and mailing lists, you
   would send a message much like the one shown below.

   Example 1  Sending Commands to a Mail Server

   $ MAIL
   MAIL> SEND
   To:     in%"mailserv@example.com"
   Subj:
   Enter your message below. Press CTRL/Z when complete, CTRL/C to quit:
   HELP
   INDEX
   LISTS
CTRL/Z>

   MAIL> EXIT
   $

   After a short while, you will receive back three messages from
   the mail server: the first message in response to the HELP
   command, the second in response to the INDEX command, and
   the third in response to the LISTS command. If your command
   specifications are in error, then the mail server will send you
   an error notification.

   Typically, mail from the mail server will have a reply address
   which differs from the address you use to send commands to
   it. This is intentional and is done to prevent potential mail
   loops. One consequence of this is that you cannot direct further
   commands to the server by replying to messages from it. You must
   always initiate a new message with the send command; you cannot
   use the reply command.

   A brief description of the available commands is given in the
   table below; complete descriptions are described under the
   "Commands" subtopic. Lines beginning with an exclamation point,
   !, are interpreted as comment lines.

   Table 2 Summary of Mail and List Server Commands

   Command          Description

   CONFIRM          Confirm a command from a previous message
   DIRECTORY        Obtain directory listing of available files
   DIRECTORY/LIST   Obtain directory listing of available mailing
                    lists
   ENCODING         Set default file transmission encoding
   END              Terminate processing, accept no additional
                    commands
   EXIT (see END)   Same as END
   FINISH (see      Same as END
   END)
   HELP             Retrieve the server-specific help information
   INDEX            Retrieve the index of available files
   LISTS            Retrieve the index of available mailing lists
   MAXIMUM          Set maximum message size; large messages will be
                    divided into several messages, each smaller than
                    this size
   MODE             Set the default file reading mode
   PURGE/LIST       Purge comment lines (such as unsubscribed
                    addresses) from the membership list
   QUIT (see END)   Same as END
   SEND             Retrieve the specified files
   SEND/LIST        Retrieve the membership list for a given mailing
                    list
   SEND/LIST/COMMENTRetrieve the membership list for a given mailing
   (see SEND/LIST)  list, including members' RFC 822 comment fields
   SEND/LIST/NOCOMMERetrieve the membership list for a given mailing
   (see SEND/LIST)  list, stripping members' RFC 822 comment fields
   STOP (see END)   Same as END
   SUBSCRIBE        Subscribe to a mailing list
   UNSUBSCRIBE      Unsubscribe from a mailing list