Greylisting protects email users from spam. When you enable greylisting, the email server temporarily rejects any email from a sender that the server does not recognize. If the email is legitimate, the server that sent it will try to send the email again after some time. After a sufficient period of time, the server will accept the email.
Step 1
Logged into your cPanel in the “EMAIL” tab, locate the “Configure Greylisting” item.
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Step 2
Locate the domain in the list or type the domain name in the “Search” text box.
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Clique em "ativado/desativado*"* no canto direito para ativar ou desativar a Greylisting.
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Hope this helps !