This is now an officially documented protocol implemented by many
other network sites.  Full description is in RFC 743, obtainable from
[SRI-NIC]<NETINFO>RFC743.TXT

	Description of new XRCP command for FTP:

XRCP allows a user of an ITS FTP server to mail some
text to several recipients simultaneously, rather
than having to send the text again for each.  Its
use is as follows:
	XRCP <rcpt string>
can be given at any time during the FTP dialogue; the
reply will be either 200 for "Rcpt OK" or 450 for
"Rcpt not OK".  Any number of XRCP's may be given.
All recipients so specified and acknowledged by a 200
will be remembered by the server.  When a standard
MAIL or MLFL is given (with or without a rcpt specification)
the message text furnished will be sent to everyone specified
by the previous XRCP's.  Whatever the result of the MAIL
or MLFL, all rcpts saved will be forgotten, in preparation
for another message.
	Note that whereas the result of a XRCP has no effect on
other XRCP's, a failure return for a MAIL or MLFL applies to
ALL the rcpts specified.  For this reason, it is unwise
to specify an additional rcpt with the MAIL/MLFL, since
a 450 reply to the string is indistinguishable from a global
failure for all rcpts.  Of course, if only one rcpt
is being specified, the normal MAIL <rcpt> method should
be used.