This happened to me a few weeks ago. I received the same message on my dashboard, so I contacted support immediately to ask about it. I received a <B>reply</B> from support to the email address I have listed in my blog as my contact. We were then able to continue email correspondence to sort out the reason for the warning, which in my case, turned out to be just a bit of confusion. It was all straightened up and I continue to be a happy WP camper.
The advice to contact support immediately is the smartest move. They will not (as Mark points out) seek out the blogger via email... that's why they place the warning on the blogger's dashboard where it's plainly visible. With millions of blogs, it would be unreasonable to expect them to look us up.
Bottom line is not to ignore those warnings. They don't always mean doom, they just mean you need to contact them. ;-)