I wanted to upgrade to the newer edition of Plesk as it has some interesting features for controlling outgoing mail that make my life easier. So I wanted to upgrade and ran into some weird issues...
We need to generate DK (DomainKeys) to validate that we are the original senders and not someone impersonating us, this tutorial is meant to explain how generate the keys
Shows up a detailed process on how to set up SPF + DK + DKIM with Postfix in Plesk 11.5 on Debian Wheezy, step by step, and how to test to make sure everything is working correctly