With a little research and a little learning about how fighting Spam works, I have found out why Hotmail and other mail accounts fail to accept email originating from this site.
Long story short, our server's IP was blacklisted because it used to belong to or be exploited by spammers. I have requested a delisting as the IP is under new ownership (ours).
The delisting was already accepted and the problem should be solved now.
If you still have trouble receiving email from this site, please ask for help in the Tech Support forum.
Season's Greetings,
Seraph0x
