Dmarc
Add SpamAssassin GUI in Plesk (for Windows).
http://spamassassin.software.informer.com/download-spamassassin-gui-interface/
1
vote

You can configure Spamassassin in Plesk UI already. Just go to Tools&Settings → Spam Filter.
It is not a good idea to install any third-party software for SA configuring beside the Plesk.
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IG