How to decrease the risk of outgoing spam in Plesk for Windows Server with MailEnable

Question

How to decrease the risk of outgoing spam in Plesk for Windows Server with MailEnable?

Answer

1. Remove the localhost from the whitelist and switch on limitations on outgoing mail. For details refer to this KB article.

2. Enforce SMTP authentication : in Plesk, go to Tools & Settings > Mail Server Settings > click authorization is required and check SMTP

3. Forbid the users to send emails from non-existing email addresses:

   1. Connect to a Plesk server via RDP.

   2. Start MailEnable Management console at Windows Start > All Programs > MailEnable.

   3. In MailEnable Management console, expand Servers > localhost > Services and Connectors > right-click on SMTP and open its Properties.

   4. In SMTP Properties window, switch to the Security tab and disable the option Authenticated senders must use address from their postoffice

      
      
      
      

4. Ensure that Allow relay for privileged IP ranges is disabled.

   1. In MailEnable Management console, expand Servers > localhost > Services and Connectors > right-click on SMTP and open its Properties.

   2. In SMTP Properties window, switch to the Relay tab and uncheck the option Allow relay for privileged IP ranges if it was enabled.

      
      
      
      

5. Restart the MailEnable SMTP Connector service:

   1. In MailEnable Management console, go to Servers > localhost > System > Services Status.

   2. Select MailEnable SMTP Connector.

   3. Click Restart in the right pane.