When you talk about auto responder most people will immediately think of using aWeber probably because it is the most well established of the auto responders. However, I always found aWeber to be very buggy and give me problems so I have just changed over to Mail Chimp as the service and product seems a lot better and the price is comparable.
The interface is COMPLEATLY different from that of aWeber but it only took me half hour or so to get lists and auto-responders up and running and options coming in, so I have to say I like it far more. If you want to discover more and I really suggest that you do you need to go to: http://mailchimp.com/
Tags: Mail Chimp