If you are getting below error while doing test scan then you have to set root forwarder in CSF.
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We can set root forwarder with below steps:
First you have to check for /root/.forward file if its not available then you can create this file and add email address in it. This step will resolve your error.
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WARNING The root account should have a forwarder set so that you receive essential email from your serverFirst you have to check for /root/.forward file if its not available then you can create this file and add email address in it. This step will resolve your error.