I got it to set up DKIM, I sent a test mail to check-auth@verifier.port25.com and reply was :
SPF check: pass
DomainKeys check: neutral
DKIM check: pass
SpamAssassin check: ham
looks good, but why DomainKeys check just neutral ? in the mail-header I see the DKIM-signature, is that a big problem that its just neutral ? how to fix that ?