The send command allows you to send mail to a remote node or to place a 
message within an area on this mailbox. The send mail command will not
deliver mail to a station on the PBBS network unless it is mailed via
a mail clearing node, for example GB3XP. The format of this command is 
complex but here is a brief overview.
S <area-name>                         - send a message to an area. 
S <user-name>                         - send mail to another user here.
S <user> @ <host> [< from] [$bull-id] - send to a user at a remote node.
SR [msg-number]                       - reply to a message
SF <user> @ <host> etc etc...         - forward current message
S <user>%<host> @ <via-host> [< from] [$bull-id] - send on specific route 
The from and bulletin-id fields are for specialised use. The S command 
may be followed by P, B or any other message type you use. For example,
SP kelvin @ g1emm.ampr.org < G1XYZ $XYZ123
PLEASE NOTE:- 3rd PARTY MAIL IS ONLY PERMITTED ON GB7xxx NODES!!
