-This command adds a new mailbox, deletes and existing mailbox, or
-lists the mailboxes currently assigned to
-.IR username
-(your own name by default).
-If neither the
-.B -a
-or the
-.B -d
-option is given, the current mailboxes will be displayed.
-The options will attempt to add or delete the specified mailbox.
-A mailbox address is of the form
-.I string@hostname,
-where the string is usually the username, and the hostname is the name
-of the machine the user wishes to receive mail on.
+Your post office box is what determines where you will receive
+mail. It can be of several types:
+.I POP, IMAP, SMTP, SPLIT
+or
+.IR NONE .
+
+In the first use of this command, the post office box of the
+user whose name corresponds to the single argument
+.I username
+(or your own name if
+.I username
+is not specified) is displayed.
+
+In the second use, this command sets the
+actual address that will receive mail sent to
+.I username@MIT.EDU
+(where
+.I username
+is your own name if you have not specified it on the command line).
+It should be used if you want to change where you will
+receive mail.
+
+The
+.I chpobox
+command is used instead of the file
+.I .forward,
+which would be used with standard UNIX mail.
+
+In order to change the address that receives mail sent to
+.I username@MIT.EDU,
+use the
+.B -s
+option. Specifically, to reroute your mail to
+the address
+.I name@host,
+you would issue the command
+
+.nf
+.nj
+chpobox -s name@host
+.fi
+
+To split mail between your local post office box and a remote address,
+use the
+.B -S
+option.
+
+To restore your post office box to its original Athena default,
+use the
+.B -p
+flag. This will set your mailbox to the last POP or IMAP server
+it was using.