If you use AWeber as your autoresponder you get 500 subscribers within your initial plan. As soon as you hit 501 subscribers you begin paying additional monthly fees of $10 per month.

(If you do not want to pay monthly fees just because you have new subscribers you should get an autoresponder like this one.)

For example, assume 550 people initially entered their email address to receive your newsletter. 20 people failed to confirm their email address. Of those who did...