I need to provide email marketing to my clients but I do not want them to have to go off-site to another service, nor do I want to have to create hundreds of accounts on a remote service.
Ideally the email-marketing provider would have two parts to their solution.
1. They deliver all emails and provide stats and auto-responder services by way an api
2. They provide a client interface that I can host on my own server, that allows me to give clients an interface where they can manage their own lists and create templates etc...
Are there any email-marketing companies out there that do this and if so what are the rough costs? Are we talking a few hundred bucks a year or are we talking thousands?