It is possible that you can generate content of your email from an outside source and then push it to us via our API's. You would do this by using our Campaign API, which will allow you to create a custom HTML or XHTML email on our system. You would need to create the HTML, and also set up a mechanism that also includes the content that you are generating, and put it in the required XML format and POST it to the Campaign URI.
If you have any questions about this specifically, or other things that you can do with our API's, please let me know.
I removed your email address for security reasons. I also wanted to let you know that I sent you an email with some additional information. Most everything a developer would need to create an integration with Constant Contact can be found here on this site. We don't have step-by-step instructions for everything, but instead offer documentation on using our REST API services, as well as wrappers and sample forms, these developer forums, and developer email support. I always recommend searching the forums initially, because the solutions to many common issues can be found there.
