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Google systems have tested 5 pages from your site and found that 100% of them have critical mobile usability errors. The errors on these 5 pages severely affect how mobile users are able to experience your website. These pages will not be seen as mobile-friendly by Google Search, and will therefore be displayed and ranked appropriately for smartphone users
Is friend a big spender on AdThingy?
If many people had received the message, we'd be seeing a mass panic by now.
Google systems have tested 5 pages from your site
critical mobile usability errors.
A Google Webmaster Tools account would be my first guess.
one (very obscure sub-)page tested of a site with hardly any traffic
I wonder if emails will go out about HTTPS as well.
This site is mobile friendly
The serps don't use the word "site", the phrase used is simply "Mobile-friendly"
The site in question, on the e-mail, is a very old site and does not have GWT or GA, AdSense, etc.
Interesting that no oxygen-breathing Google account is associated with it.
...that site was tested on smartphones and tablets before launch.
A fast, free test at Google's "Mobile Friendly Test" site: [google.com...] will tell you why they think the site is not responsive and how to fix.
Yikes. One page? On a site big enough to merit the "sub-page" descriptor? If you feed the page into the Mobile Usability thingummy, does it fail comprehensively?
Do you use plugins? They seem to hate those. I also suspect that the mere existence of an @media rule involving "max-width" may be enough to get you off the hook.
No new messages or recent critical issues.