Several German webmasters received fake penalty notification emails that allegedly came from Google Search Quality from email@example.com. Google has clarified that these emails have not been issued by Google.
Google has clarified that these emails are not related to any of Google’s efforts concerning webmaster notification and they have temporarily discontinued sending such emails till they provide more secure communication mechanisms. They further clarify that 301 redirects (mentioned in those emails) are not a violation of Google Webmaster Guidelines.
How to identify a true Google email?
* The sender email has an @google.com address
* Google emails never include an attachment.
* They direct the webmaster to a reinclusion request form
Google drives huge search engine traffic to websites and such warning emails can really make webmasters anxious. Follow the webmaster guidelines always and you have no reason to worry. And if you are truly banned by Google, file a reinclusion request.