'Override this abstract method to handle messages from the client.
peer is a tuple containing (ipaddr, port) of the client that made the
socket connection to our smtp port.
mailfrom is the raw address the client claims the message is coming
from.
rcpttos is a list of raw addresses the client wishes to deliver the
message to.
data is a string containing the entire full text of the message,
headers (if supplied) and all.  It has been `de-transparencied\'
according to RFC 821, Section 4.5.2.  In other words, a line
containing a `.\' followed by other text has had the leading dot
removed.
This function should return None, for a normal `250 Ok\' response;
otherwise it returns the desired response string in RFC 821 format.'

def process_message(self, peer, mailfrom, rcpttos, data):

    raise NotImplementedError
