When you open certain emails, Gmail displays linked pages on the right side of the page. It looks like this:

I canโt find the documentation, although Iโm trying to figure out how to associate a specific email address with a Google+ page. For example, let's say we have a + page http://plus.google.com/example , and we linked it to the official domain http://example.com - it does not automatically display a + page in Gmail next to all emails that come from the domain example.com.
Iโm trying to customize the display of the corresponding page from all emails that are sent from the site foo@example.com , but I canโt find work on what I need to do to link this letter to the + page.
Does anyone know how to do this?
Thanks in advance.
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