Google's John Mueller posted on Twitter A PSA that you should make sure your website contact forms work. He wrote "if you have a contact form on your website, not receiving any submissions isn't a good sign."
Pro tip: if you have a contact form on your website, not receiving any submissions isn't a good sign.
— John ☆.o(≧▽≦)o.☆ (@JohnMu) December 6, 2016
The reason is, he is trying to contact a website that has noindexed their site and it is unable to be indexed and ranked in Google. He said "I'm just trying to contact a site about a site-wide noindex."
@dawnieando @AlanBleiweiss Well, in this case I'm just trying to contact a site about a site-wide noindex. Unfortunate. info@ bounces too.
— John ☆.o(≧▽≦)o.☆ (@JohnMu) December 6, 2016
Google has done this many times in the past, I suspect it is still part of their routine. It is good to see this happening because it is good to see Google doing one-on-one outreach, even when it doesn't work. It shows a huge effort on Google's part to help webmasters.
Of course, those sites that have broken contact us forms are probably not terribly worried about their search traffic. :)
Forum discussion at Twitter.