In case you want to decrypt your DMARC forensic reports which were previously encrypted by you, you need to log in to your DMARC analyzer portal and navigate to the DMARC Forensics section. When on the page, you will find your feedback headers and mail headers with an option to view them. Click on the "View" button for your mail headers. The encrypted Forensic report can now be copied and decrypted using your private PGP key and password.
Note: PowerDMARC's DMARC Analyzer is not configured to allow forensic report decryption. However, you can use https://8gwifi.org/pgpencdec.jsp or any other online tool available over the internet, to decrypt your PGP encryption. Simply enter your private key, password, and encrypted message and the tool will help you decrypt and view your report details instantly.