Spam E-Mail not delivered

How to prevent somebody using your Domain for sending SPAM Mails

Recently I noticed that I receive regularly “Delivery Failures” and “Out of office replies” for mails I have never sent. It was obvious that somebody started to use my domain for sending SPAM e-mails to various addresses. This is not only annoying, but also your domain could get “black listed” as soon as SPAM protection services realize that this type of mails are being sent from your domain. Based on a forum post on the Digital Point forum, I summarized the steps I followed to prevent the abuse of my domain for SPAM.