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Question DKIM for Domain-Alias?

NBadmin

New Pleskian
We have a server where the email-server is disabled via Plesk and DNS uses external nameserver.
We have a vHost with domain olddomain.com and alias newdomain.com. Unfortunately I can not switch the two domains as Plesk would rename the webspace folder.
We enabled dkim like described here: How to enable/disable DKIM signing for all domains in Plesk for Linux
Now all mails are signed but with
Code:
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=olddomain.com; s=default;...
Is there a way to get it signed with newdomain.com instead?
I tried with postfix generic_maps but it looks like the replacements from the generic-table are done before the DKIM-signing ...
 
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