Does anyone know how to implement domainkeys in postfix mailserver

i have dkim so far but i cant get the domainkeys in here is my email header

Code: 
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showstopper Reviewed by showstopper on . DomainKeys Does anyone know how to implement domainkeys in postfix mailserver i have dkim so far but i cant get the domainkeys in here is my email header From admin@chatalker.com Sun May 2 16:53:52 2010 X-Apparently-To: fortune.osei@yahoo.com via 68.180.199.125; Sun, 02 May 2010 09:54:31 -0700 Return-Path: <admin@chatalker.com> X-YahooFilteredBulk: 190.93.75.216 X-YMailISG: Rating: 5