Does this fallback to gravatar? I'd be interested in a service that does something similar to Rapportive and just gives me a picture for an email from any sour

Does this fallback to gravatar? I'd be interested in a service that does something similar to Rapportive and just gives me a picture for an email from any source. Only a quarter of users have avatars [1] but when you add in linkedin, facebook &c that gets much higher. [1] http://euri.ca/2013/how-many-people-use-gravatar/index.html http://euri.ca/2013/how-many-people-use-gravatar/index.html