can't send or receive email, network on block list?

i've set up exchange 2013 for the first time and when i log into the browser and send a email to my Microsoft account i get the following error:

BAY004-MC2F50.hotmail.com gave this error:
OU-002 (BAY004-MC2F50) Unfortunately, messages from 86.10.3.44 weren't sent. Please contact your Internet service provider since part of their network is on our block list.

when i send a email from my Microsoft account to my exchange i get the following error:

'Administrator@dragoninfotechs.info' on 27/03/2015 21:04
Server error: '550 relay not permitted'

i can send mail to my gmail account no problems. looks like Microsoft have blocked my ip, but maybe its something i've missed? this is the first time i've set up a exchange server. any feedback would be greatly appreciated.

cheers.
mike.