update docs

Author: Clivern

README.rst

@@ -67,3 +67,17 @@ To use pinkman, follow the following steps:
 
     $ iptables -t nat -A PREROUTING -p tcp --dport 1025 -j REDIRECT --to-port 25
 
+
+7. Create an A entry which points to the IP address of your server.
+
+.. code-block::
+
+    $ [ A ] [ smtp.orangutan.com ] [ x.x.x.x ]
+
+
+8. Create an MX entry, which points back to the A entry above
+
+.. code-block::
+
+	$ [ MX ] [ orangutan.com ] [ smtp.orangutan.com ]
+