'Fake of L{twisted.mail.smtp.sendmail} which records attempts to send
email and immediately pretends success.
Subclasses should arrange for their storage implementation to call this
instead of the real C{sendmail} function.'

def sendmail(self, smtphost, from_addr, to_addrs, msg, senderDomainName=None, port=25):

    self._email.append((smtphost, from_addr, to_addrs, msg, senderDomainName, port))
    return succeed(None)
