How to make an extra DKIM record private key so other domains outside server can be validated

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Feb 12, 2017
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How to make an extra DKIM record private key so other domains outside the server can be validated with DKIM.
Preferable the same public DKIM key for all those different domains if possible.

I use my VPS to send mails on behalve of others. I also want to have an valid DKIM for those domains to better pass email checks.
For the VPS a DKIM is setup with the selecter x. So i need something like mailer. als selector
 
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