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Question Change DKIM signature prefix

Hausherr

New Pleskian
Server operating system version
Debian 11
Plesk version and microupdate number
18.0.41
How can I change the default prefix of the DKIM signature? Can this be done directly in Plesk or does it require configuration in Postfix?
 
To my understanding you can change (or add) a selector instead of the Plesk 'default' and also add that selector as file name near 'default' file_name which contains the private.key, on the Plesk server.

What I'm not sure about is, would postfix fetch not only the 'default' selector key when generating emails and signing them?
 
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