When you open an email from someone in Mac Mail, their profile picture (set in the Contacts app) is displayed. If a profile pic is not found, a circle with that user's initials is displayed.
Is there a way to publish a profile pic associated with my email address, so any user of Mac Mail can see that profile pic when I send them emails?
For Gmail web clients, I need to set a profile pic in Google+. For the Fastmail web client, I need to set a profile pic on Gravatar. But I don't know of a way for Mac Mail. Is there one?