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Event ID: 4503 Source: HealthService

Source
Level
Description
A module reported an error <error code> from a callback which was running as part of rule "<rule name>" running for instance "<instance name>" with id: "<instance id>" in management group "<group name>".
Comments
 
In my case, the resolution was as follows: Open Operator Console -> Administration -> Settings -> Notifications -> Email Tab. I changed "return address" from Monitoring:helpdesk@domain.com to "Monitoring"helpdesk@domain.com.

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