How do I disable showing of the contact photos in OSX mail in the message headers in the message view? The faces distract me from the messages. They are pulled from some ldap server based contact list I guess. I can hide them when I set the headers to "show header detail: None", but I need the headers. Custom header selection seems to be broken. I can remove some or all of them and it has no influence on what is being displayed.
I use classic layout, so I already don't see them in the message list. OSX Mail Version 6.6 (1510)