Inbound email - error unable to find a record for processing

[VaranAwesomenow]

Sometimes in Inbound email log you will receive an error that says 'unable to find the record for processing', this happens even though inbound email is a response to valid reference in ServiceNow, this happens because of following reason

When domain separation is enabled or when a company is assigned to a record then ServiceNow ensures that the sender (a user record in ServiceNow or a guest user) of an inbound email has correct access to the record in the system, if the user doesnt have access then ServiceNow will not be able to find the record with that user, this is a case of impersonation via email. Hence email log will display an error that says 'unable to find record for processing'