LinkedIn unveiled a new email-related product called Intro today, making use of last year's acquisition of Rapportive. Basically what it does is show you information about people you receive emails from so you can get a better idea of who they are - right in your inbox.
Right now it's just for iPhone, and utilizes the iPhone's Mail app.
"The growth of mobile email is simply staggering," says LinkedIn's Rahul Vohra, who co-founded Rapportive. "Four years ago, less than 4% of emails were read on mobile. Today, half of all emails are read on a mobile device! So we set ourselves the challenge: bring the power of LinkedIn, and the technology of Rapportive, straight to the Apple Mail app on your iPhone."
This pretty clearly illustrates what Intro does:
As Vohra explains, the info provided by Intro can be the difference between deciding whether you're receiving spam or a legitimate email.
The product supports Gmail, Google Apps, Yahoo Mail, AOL Mail and iCloud. Outlook.com is noticeably absent from the list, as is Android.
You can enable Intro here by giving them your phone number.