Hi,

I have a few domain names and I notice that all emails send to hotmail/live/outlook.com are not reachable.
I also did a test to send emails from my email accounts (my own domains) and all emails never reach at my live inbox.
My friends that have hosting on same hosting also having the same problem.
I did check with my host and they said all email mark as delivered and has been process by outlook.com.

For your info, I have no problem to send emails to other provider, such as gmail.