I'm using my nba-live.com address, which is actually hosted by Google. A little while ago I did notice that I wasn't getting some of the notifications, and logging in through GMail (I generally download my email through Outlook), I noticed that they were being marked as spam, which I was able to resolve. However, a lot of spam filters also bounce the emails before they're even delivered to a junk mail folder, which is annoying.
On one hand, it's nice that a lot of hosts have such vigilant anti-spam protection these days, but it does tend to catch out newsletters and automatically generated emails. I'll see what I can do from my end; perhaps re-writing some of the notification messages will make them appear less "spammy", and thus less likely to be flagged.