Using JangoMail as a discussion server allows recipients to respond to the entire email list. Use this tool if you want everyone listed on your original email to be able to discuss the content of your email.
This feature allows you to stay in touch with your clients in a more intimate way. This also allows you to see reaction from all of your clients. This may give you a better grasp on what is working, and what is not working. You can work on emails that receive negative reaction and keep the ones that seem to be working well.