A great update from Webmaster Tools: When we discover critical issues with a website, Webmaster Tools will now automatically email you about it.

Most sites are run well and don't have critical issues, and so will get these emails rarely, if ever. We also cap the number of messages we send out in a given time period and you can change the email delivery settings to disable these alerts.

More:
http://googlewebmastercentral.blogspot.com/2012/10/keeping-you-informed-of-critical.html
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