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If I login to the web interface SmarterMail and send an email, its adds the "Domain Key Signature", and various "Domain Key Signature" validation websites confirms that the DKS passes.
However, if I send a email from Outlook 2003/2007/2010 IMAP account, the "Domain Key Signature" doesn't get added, and validation fails.
Can SmarterMail be configured to add the "Domain Key Signature" to Outlook generated emails?
PS. I have an internal DNS record for our SPF and those test pass whether send via SmarterMail web interface or Outlook.