 - Properties object that hold relevant properties.<br>
                  It is expected that the client supplies values
                  for the properties listed in Appendix A of the
                  Jakarta Mail spec (particularly  mail.store.protocol, 
                  mail.transport.protocol, mail.host, mail.user, 
                  and mail.from) as the defaults are unlikely to 
                  work in all cases.</dd>
<dd><code>authenticator</code> - Authenticator object used to call back to
    