Hi Duo,
Our Dynamic Forms and Dynamic Registration can both be used as ecommerce solultions and can easily integrate with Opt In Email. Please visit www.datasprings.com/formdemos and check out Demo 6, Demos 15-18 for various examples.
If you do need to work with Sales Force, you might find these links helpful:
Dynamic Forms connecting to Sales Force
https://www.datasprings.com/dnn-modules/dynamic-forms/hot-to-connect-to-salesforce/
Receive Silent HTTP posts into Dynamic Forms / Dynamic Registration
http://www.datasprings.com/news/blog/postid/21 Thanks!
Candace