I am looking for recomendations on third party software for settin up Customer mailing lists. The idea is to have my customers come to a web page, and choose which email lists they want to either be a member of, or remove themselves from a list.
The 3 most important criteria are;
1. Easy for a customer to make changes from a web interface.
2. Works with Exchange 2003
3. Low cost or free.
I appreciate feedback on what software you have used to implement a system such as this, and how it has worked for you.