Be very alert about this and other emails that seem to come from Blizzard. They aren’t.  Common sense, place your mouse over the links in the email and make sure they point to Blizzard.com or WorldofWarcraft.com before clicking them. Their aim is to steal your username/password.  One of the emails point to a website hosted at freehostia, and the other one links to a guild website. Both with a fake WoW account page. This is the fake email in question:

Greetings,

An investigation of your World of Warcraft account has found strong evidence that the account in question is being sold or traded. As you may not be aware of, this conflicts with Blizzard’s EULA under section 4 Paragraph B which can be found here: WoW -> Legal -> End User License Agreement
and Section 8 of the Terms of Use found here:
WoW -> Legal -> Terms of Use

The investigation will be continued by Blizzard administration to determine the action to be taken against your account. If your account is found violating the EULA and Terms of Use, your account can, and will be suspended/closed/or terminated.
In order to keep this from occurring, you should immediately verify that you are the original owner of the account.

To verify your identity please visit the following webpage:
https://www.wow-europe.com/login/login?service=https%3A%2F%2Fwww.wow-europe.com%2Faccount%2F
Only Account Administration will be able to assist with account retrieval issues. Thank you for your time and attention to this matter, and your continued interest in World of Warcraft.

Sincerely,

Account Administration
Blizzard Entertainment