Preventing SPAMMERS using your mail server This option describes how to configure Mail essentials to stop spammers using your mail server. Incorrectly configured mail servers can allow external people to use your mail server as a spamming mail server. In many cases this will result in your domain becoming blacklisted. Therefore you need to ensure that both your mail server as well as the Mail essentials server can only be used by authorised machines. You can protect the Mail essentials server easily by configuring the server not to relay any mail unless it is being sent by your mail server. To configure this: More: If you have Windows 2000 If you have Windows NT