The Email Protection > Deanonymization tab is only accessible if anonymization is activated (see Logging & Reporting > Reporting Settings > Anonymizing).
Here it is possible to abandon anonymization for specific email addresses and/or domains regarding email protection reports. Proceed as follows:
Enter both passwords.
Enter the first and the second password that have been provided to enable anonymization.
Make the following settings:
Deanonymize addresses: You can add email addresses you want to deanonymize.
Deanonymize domains: You can add domains you want to deanonymize.
Your settings will be saved.
Provided email addresses and domains become readable in reports.