According to these people I have been deemed to be an evil SPAMER using a spam IP address. But maybe it is the relay point that was rejected. Bit hard to tell really. I just get a nearly useless generic message.
Connected to 18.104.22.168 but sender was rejected.
Remote host said: 550 Mail rejected by Windows Live Hotmail for policy reasons. A block has been placed against your IP address because we have received complaints concerning mail coming from that IP address. We recommend enrolling in our Junk E-Mail Reporting Program (JMRP), a free program intended to help senders remove unwanted recipients from their e-mail lists. For enrollment instructions, please refer to: http://postmaster.live.com/Services.aspx#JMRPP. For additional information about Microsoft's technical guidelines, please refer to: http://postmaster.live.com/Guidelines.aspx