Promotional content in order confirmation, shipping notice, etc emails are common in eCommerce – here is a tiny code snippet to make this possible in Magento (Community or Enterprise). I recently added this to the Enterprise implementation for my current customer and everything appears to be working without issue.

1. Add reference to CMS block in transactional email template

 {{block type="cms/block" block_id="ford-order-confirmation-promotions" }}

2. Create CMS block, make sure identifier of block matches.
3. Test your email

Simple right? This could be taken a step further with a little code to select a CMS block based on certain conditions (customer type, purchase history, etc). Anyone want to share that code?