Lynn's right. A mailing list is your biggest asset. It's not easy to build a list
and it's even harder to build a relationship with your subscribers.
When you're ready to switch to Aweber, you may find that your mailing list
of 10,000 subscribers can be reduced to a couple of hundreds overnight.
I'm speaking from experience.
People are busy on the net and sometimes even if they really like getting
your mails, they're too lazy to click that confirmation link. I've been one of
those lazy people.
Anyway, something to think about.
But if you really want a free autoresponder, GetResponse does offer
a free version (with less features of course).