This is the error...
I use DNSexit - my mail gets delivered to everywhere else - just not hotmail.
<@hotmail.co.uk>: host mx3.hotmail.com[220.127.116.11] said: 550 DY-001
Unfortunately, messages from 18.104.22.168 weren't sent. Please contact
your Internet service provider. You can tell them that Hotmail does not
relay dynamically-assigned IP ranges. You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL