DAMRC makes it easier for you to comabt phishing and to recognise the abuse of your domain name. It has already been adopted by many major domains such as gmail.com, facebook.com and paypal.com. If you run a mailserver you should at the very least look into DMARC (and then implement it).
If you run a Debian/Postfix/Dovecot mail server have you covered with this tutorial:
