Three days ago I received a message supposedly from the Google AdSense team (Google Adsense"<adsense-adclicks-noreplygoogle.com>).

Looking to the headers of the message it says "Received: from mail.keronite.com.tw"

"Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning adsense-adclicks-noreplygoogle.com does not designate XX.XXX.XXX.XX as permitted sender"

It was in my spam folder and no "to" address was specified. New kind of spam or something? although I don't see the point. The message below.

<<Hello,

While going through our records recently, we found that your AdSense
account has posed a significant risk to our AdWords advertisers. Since
keeping your account in our publisher network may financially damage our
advertisers in the future, we've decided to disable your account.

Please understand that we consider this a necessary step to protect the
interests of both our advertisers and our other AdSense publishers. We
realize the inconvenience this may cause you, and we thank you in advance
for your understanding and cooperation.

If you have any questions about your account or the actions we've taken,
please do not reply to this email. You can find more information by
visiting
https://www.google.com/adsense/support/bin/answer.py?answer=57153.

Sincerely,

The Google AdSense Team>>

I just got one of these, too. My thoughts were, like you, why? I then got to thinking that probably this is a huge spam mailing and they are trying to identify active email accounts and hoping that people will respond saying, "what the hell do you mean my account is suspend?"

No, it's spam. With the mail comes a HTML file. When you open this file you will be redirected with a metatag to a AdSense phishingpage. The website is hosted on a free hosting service. Also note that no receiver is specified.

Oops I was ready your anser wrong, yes it was spam indeed :-).