'Called when an attempt to send an email is completed.
If some addresses were accepted, code and resp are the response
to the DATA command. If no addresses were accepted, code is -1
and resp is an informative message.
@param code: the code returned by the SMTP Server
@param resp: The string response returned from the SMTP Server
@param numOK: the number of addresses accepted by the remote host.
@param addresses: is a list of tuples (address, code, resp) listing
the response to each RCPT command.
@param log: is the SMTP session log'

def sentMail(self, code, resp, numOk, addresses, log):

    raise NotImplementedError
