I am not sure about your DS question on roles - you can download the manual from DataSprings website without purchasing the module (a great thing for any module developer to do IMO).
Yes, by third party I mean NOT integrated with DNN portal, except that you can easily create a 'sign up' module that will allow people to join the list using a text/html module. Important questions for you:
- How many outgoing smtp emails can you send at once? I'll bet it is not 1000.
- Do you really need DNN integration? Sending to people that are registered on your site through DNN login process, etc.?
- How much time do you want to spend setting this up? iContact will be much less time than DS.
One big advantage of iContact-type products is that this is all they do - they deal with spam, bounces, upgrades, etc. so you do not have to. They also have great and detailed reports about who is clicking what in your emails. Note that Snowcovered sells DS OptIn but uses iContact to send out their weekly emails.
The person who is going to make a bundle is the one that comes up with a module/API/integration for an iContact or Constant Contact type product to work with DNN.
Hope this helps,
Will