How to Enable Greylisting from WHM

Greylisting is an effective spam-filtering technique that temporarily rejects emails from unrecognized senders. The assumption is that legitimate mail servers will retry sending the email after a short delay, while most spam servers will not. This method significantly reduces the amount of spam your users receive.

How to Enable Greylisting in WHM

1. Log in to WHM: Access your WebHost Manager as the root user.
2. Navigate to Greylisting: In the WHM search bar, type “Greylisting” and click on the option under the Email section.
3. Toggle to Enable: By default, Greylisting is often disabled. Click the “Off” button to toggle it “On”.
4. Configure Settings (Optional): Once enabled, you can fine-tune its behavior using the available tabs:
   • Configuration Settings: Adjust the Initial Deferral Period, Resend Acceptance Period, and Record Expiration Time to control the temporary rejection and acceptance timing.
   • Trusted Hosts: Add IP addresses or ranges that you know are safe and should never be greylisted. These can be specific IP addresses or entire mail providers you trust.
   • Common Mail Providers: This list automatically trusts popular email providers like Gmail and Yahoo, ensuring their emails are not deferred.
   • Reports: Review a log of greylisting actions to see which emails have been deferred, accepted, or blocked.
5. Save Changes: After making any adjustments, click the Save button.

The changes will take effect immediately, and your server will begin filtering incoming emails based on the Greylisting rules.