Hello there guys.
First of all, we are ESP sending emails for our customers. We want to sign the outgoing emails with both DomainKeys and DKIM. (both). I know the DKIM is successor to DomainKeys, but the Yahoo mail server still checks both of them. I already signed our emails with DKIM (it's automatically generated and configured through cPanel) but i can't seem to be able to sign it with DomainKeys.

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Here is our email header:
Received-SPF: pass (domain of ------------ designates -------------- as permitted sender)

domainkeys=neutral (no sig); from=--------------; dkim=pass (ok)
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but the other ESP's are able to sign both keys. Here is the example:

domainkeys=pass (ok); from=xxxxxxxxxxxxx; dkim=pass (ok)




How can i sign DomainKeys ? How to configure it? Thank you very much in adnvace. Hope you guys can help me.