I know of 2 autoresponders that are very good, and both well known in the Internet Marketing niche. I’ll be upfront, and say that I use Aweber, so while I can give my personal opinion of that, I don’t know GetResponse all that well, and only from what I’ve heard from others.
Aweber – You get an entire month to try it out for $1.00, and then it’s $19 a month for up to 500 subscribers (less if you pay quarterly or yearly). What’s great about them? Even if you don’t know how to program, they make it very easy for you to create a form that you can put on your website so that you can start building your list.
It’s also very easy to set up new emails to send out, both as a broadcast message and as a followup email. I’ve been using them for quite a few years now, and have never had any issues with them.
Get Response – They start off at $9.95 a month (less if you pay yearly), and that gets you up to 250 subscribers. They also offer plenty of templates so that you can easily have a nice opt-in box on your website even if you can’t program.
Again, while I do not use them, I know of a lot of big name Internet Marketers who do, and they seem very happy.
I’m sure that if you’re looking for a good, reliable company, that you can’t go wrong with either one.