Source: http://homepage.aweber.com/

Aweber is the best followup autoresponder software in the market. Since founded in 1998, Aweber has developed autoresponder software as best email marketing software that can help users to send email follow up, newsletters, email marketing to their subcribers.

Like other autoresponders, Aweber give you to take a Free Test Drive and see more details Aweber's features here.

Source: http://homepage.aweber.com/