close h close the connection
connect host return channels for
the connection with host on smtp port
data h msg send a DATA command and after the message msg.
helo h hostname send the HELO command thru the
handle h and with hostname as argument.
mail h mail send a MAIL FROM command thru handle h and with
mail as argument .
quit h send a QUIT command thru handle h.
rcpt h mail send a RCPT TO command thru handle h and with
mail as argument.