Change SES from transactional to marketing

One of the SES best-practices is "keep your mailing lists independent" this includes using separate instances for transactional from marketing.

• If you operate more than one website, you should never mix your subscriber lists. Customers who sign up for website A should never (under any circumstance) receive an email from website B, unless they sign up for that one too. The reason is simple: These customers have only agreed to receive email from website A. Furthermore, if your customers get mail from a website unknown to them, they are likely to mark that mail as spam, thus hurting your email reputation.
• Never forget: Your email campaigns are only as good as their ability to reach your customers, and following best practices can be the difference between a delivered and a dropped email. While the above best practices should help you, list management is only a part of the equation – the quality of your content also plays a big role in your ability to deliver email. Nevertheless, we hope our recommendations in this post will prove useful in your email endeavors.

See these documents:

• Maintaining a positive sender reputation
• Amazon SES Best Practices: Top 5 Best Practices for List Management