amavisd-new 2.7.1 , dkim-adsp=pass

[Marko Weber]

hello mark hello list,
i see on some server the dkim header:

Authentication-Results: mail.domainname.de; dkim=pass (1024-bit key)
                        header.i=@domainname.de header.b=cSgEVQgo; 
dkim-adsp=pass



i setup on my own mailserver amavis with dkim.
on my own machine i get following header results:

Authentication-Results: mail.domainname.de (amavisd-new);
                        dkim=pass (1024-bit key) header.d=domainname.de


How can i tell Amvisd-New to also check the  'dkim-adsp' like in header 
listed above?

marko