My belief is that this boils down to Facebook. But things like this – profile pictures and email being shared – are happening more often. Fortunately, there’s little cause for concern. I’ll explain.
Where the picture comes from
Many email programs now attempt to provide more information about the sender when an email is viewed. When the program displays the email, it automatically goes out to the internet to see what it can find that’s associated with the “From:” email address. If a picture is available, the program displays that alongside the email when it draws the email on the screen.
It’s not in your email. It’s actually a function of whatever email program that the recipient is using to actually look at your email.
The picture is one that you’ve made public somehow. It’s most likely a profile picture on some online service or social media site that is somehow associated with the email address that you’re using.
Putting the face in Facebook
Blame may be a strong term, but let’s just say my first thought is Facebook in this case.
Facebook is notorious for defaulting things to have more public access than we often intend. They often will make your profile picture public and it is possible that they could even make your email address public. The net result is that email programs that are trying to provide this functionality for the recipients have that as a resource.
Another possibility is that you have a profile picture on a Google account, and your recipient is reading your email in Google Mail – or Windows Live and Outlook.com.
Personally, I wouldn’t worry about it too much.
It’s something that’s just happening on the recipient’s email program. If you are concerned, then you’ll need to spend some time reviewing the privacy settings for Facebook or Google or any service in which you have a profile picture set, particularly social media services.
Part of what they’re doing is probably in the name of being social: providing your image when email programs ask for it.