Do a search on this forum for hotmail (or gmail), and you will find a lot of info about this.
Basically you will need to contact Microsoft and ask if they add your new domain to the Senders ID program (it's a bit like a SPF record)
More info again when you do a search on the forum.
Small tip.. Do not use testing as text to test things like this.
Try to make the email look as real as possible when testing things like this.
Never execute code written on a Friday or a Monday.