How to Enable Greylisting & Use of Trusted Hosts option in Greylisting using WHM:
  • Greylisting defends email users against spam. When the Greylisting is enabled, then the mail server will temporarily reject any email from a sender the server does not recognize.
  • If the email is legitimate, the originating server will re-attempt after a delay. After sufficient time has elapsed, the server will accept the email.

1) Log in to the WHM.

2) Go to "Email" tab on the WHM.

3) Select "Greylisting" option.

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4) Click on "OFF" button to enable Greylisting.

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5) By enabling Greylisting, we can see some options like Configuration Settings, Trusted Hosts, Common Mail Providers, and Reports. You should define Greylisting configuration settings.

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6) The second option is Trusted Hosts. Greylisting will never defer emails from entries on the Trusted Hosts list. Here we can define hosts that you typically receive an email from and you do NOT want Greylisting to affect. Click on to the New Trusted Hosts to add the IP address (or range) of the host. We can also add a comment for each entry. Click on Add button to add the hosts.

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