exclude non domain user from User log on Failures report

exclude non domain user from User log on Failures report

Hi,

on my dc's I see thousands of bad user name errors from my exchange servers.
Apparantly caused by a Microsoft patch that is still not fixed.
I want to exclude these errors from AD Audit, I tried editing the rules under configuration, advanced configuration, Logon Failure events.
But the errors keep appearing in the Dashboard.

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