The primary purpose of a transactional email is to convey information regarding the action that triggered it. But, due to their high open rates (51.3% compared to 36.6% for email newsletters), transactional emails are an opportunity to introduce or extend the email relationship with customers or subscribers; to anticipate and answer questions; or to cross-sell or up-sell products or services.
This isn't about off-the-shelf solutions. You need to really convey something illustrious and beautiful, then fill it with incredible MVP content. Over time, this will become a thriving hotbed of activity for you, where people will come by and check-in repeatedly to see what you're talking about and what value you're delivering. Keep in mind that this won't happen quickly. It will take years. Yes, I said years.
If you’re looking for inspiration, my friend Michelle Schroeder-Gardner of the website Making Sense of Sense has become the expert on all things affiliate marketing. Michelle earns more than $100,000 per month from her blog and the bulk of her income comes from affiliate sales. Michelle has had so much success with affiliate marketing that she even has her own course called Making Sense of Affiliate Marketing.