HuhuMails is a high-performance, worry-free transactional email sender for Amazon SES that makes sure your emails are sent within your rate limit. It's because Amazon SES does not schedule your emails. It simply fails when you reach your rate limit.
I couldn't find any service on the market for scheduling transaction emails using Amazon SES, so I created one. HuhuMails makes it simpler to send your Amazon SES transactional emails. Just push all your emails to HuhuMails and it will take care of the scheduling according to your rate limits. And if it fails, your email can still be retrieved and sent again at a later time.
It also supports scheduling to send an email on a specified future date. Please check the documentation for more details and how to use the API.
The web server is hosted on Amazon EC2 so you would also enjoy the benefit of the SES free tier program which allows you to send 62,000 (as of writing) emails per month for free.
If you're interested in this service, you may check-out the pricing page or contact the author.