Gmail uses an associated Google+ profile for authenticated emails, so you need both for it to work going forward, I presume. To get started, check <a href="https:&#x2F;&#x2F;www.google.com&#x2F;business&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.google.com&#x2F;business&#x2F;</a><p>Outlook uses Facebook and Twitter, if you have these contacts integrated. Yahoo does this too: <a href="http:&#x2F;&#x2F;techcrunch.com&#x2F;2015&#x2F;03&#x2F;04&#x2F;smart-contact-cards-arrive-in-yahoo-mail-featuring-automatically-updated-contact-info-and-links-to-social-profiles&#x2F;" rel="nofollow">http:&#x2F;&#x2F;techcrunch.com&#x2F;2015&#x2F;03&#x2F;04&#x2F;smart-contact-cards-arrive-...</a><p>There really should be some kind of standard or mail header though. :) Come to think of it, services could support a vcard mime-type attachment, perhaps? Except that likely wouldn&#x27;t support URLs to profile photos... Maybe we&#x27;ve identified a missing feature of DKIM? ;-)