Most often, you require to remove all the emails in the email queue to overcome email spamming. For that purpose, just login to the WHM with the root user. On the left side menu in the WHM, navigate to “Mail Queue Manager” under the “
Email” category. Here, you can find the option to delete or attempt to delete all the messages in the queue. In order to delete the message click “Delete all messages in Queue” and the messages will be removed. Once all the messages have been removed, you will get a message that all messages are removed from your
dedicated server.