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If you enable displaying the face header (a picture of the user embedded in headers or the addressbook) then evolution silently also leaks data to gravatar.com in search for a picture of the email sender.
The upstream vertsion has a checkbox to disable searching on gravatar.com, please backport.

Thanks for a bug report. I forgot to backport it during the rebase phase, I'm sorry for that. The corresponding upstream bug is [1]. I'd also use a following upstream commit [2].

It also requires translation updates, as the [1] adds new UI strings into Edit->Preferences->Mail Preferences->Headers, the place where the new option to disable gravatar searches can be found.

An alternative interim solution would be to not ship the gravatar module in RHEL for now.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=730743
[2] https://git.gnome.org/browse/evolution/commit/?id=7d28bdf277a

The above patch adds at Edit->Preferences->Mail Preferences->Headers tab, Senders Photo section (at the top), an option:
  [ ] Search gravatar.com for the photograph of sender
which is disabled by default.

I updated the patch for the 3.12.11-17, due to missed .ui file in the package (not locally).

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2228.html