gnus-treat-mail-gravatar

gnus-treat-mail-gravatar is a variable defined in `gnus-art.el'.
Its value is

nil

Documentation:
Display gravatars in To and Cc headers.
Valid values are nil, t, `head', `first', `last', an integer or a
predicate. See Info node `(gnus)Customizing Articles' and Info
node `(gnus)Gravatars' for details.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.