Magento SUPEE-6788 Breaks email body in all email templates

Question

When I enable this security patch, all emails sent have no body. When I look at the email header I see this inside all of them dkim=neutral (body hash did not verify)

I have an exception log:

http://pastebin.com/JPCY6qfZ

I'm not much of a Magento/PHP guy to begin with, so any help would be greatly appreciated. I want to re-apply the security patch, but I need email functionality otherwise our store is useless.

Answer 1

I was able to get ours back to working by flushing the magento cache.