You will notice most of the noted internet marketers are using Aweber ( or a re-badged Aweber like Mike Filsaimes's Pro-sender). With the recent changes to Get Response, quite a few marketers have changed over to Aweber from Get Response.

There are some "free" auto-responder systems but you generally find your emails will have some adverising added to them. This does not project a professional image to your email recipients.

regards

Neil Robins