How to Exclude a specific "caller user name"?

How to Exclude a specific "caller user name"?

Hi,

I tried numerous options to exclude a specific computer account in alle reports etc. with no luck. 
Every time oud mailserver changes an user or group attribute it is logged. the eventid is 5136.

i tried the following:
- configuration - Global excluse configuration, added eventID 5136 - caller user name equals the sepcific mailserver
-
- configuration, advanced configuration, looked up the 5136 event ID under category - user modification and group modification and set a flter not equals this mailserver by caller user name, subject accountname etc. Still teh event keeps showing.

How can i exclude a specific domain computer by caller user name or other in all reports?

Help very much appreciated