How to prevent email account hijacking (and getting blacklisted!) with MDaemon

How can MDaemon Messaging Server help prevent accounts from being hijacked (and your company email server from being black listed)? Finding out that your mail server is being used to relay SPAM can be a major headache for admins and a black mark on your company. As an MDaemon user, fortunately you have plenty of tools at your disposal to help prevent this from happening.