DomainKey Activation for all PLESK Domains

[grfecom]

Hi all,

I was wondering if anyone has any idea about how to setup and activate the DomainKey feature on spam and junk preventing under all PLESK domains.

I got following information, but no clue about its implementation in PLESK either Windows or Linux platform.

http://antispam.yahoo.com/domainkeys
http://domainkeys.sourceforge.net/

Thanks,