That was the question I kept asking me myself. But after some extensive research, it always come to, there is no such thing as a free lunch.
Even this site that does provide Free E-mail Marketing, http://itshrunk.com/e183e0 , and even provide you with a Free start-up list, only doing so because they make money if they help you make money.
So guess what? I partnered with them. Keyword, partnership.
But if you know of anything that is free online, let us know.
You get what you pay for in this case.
Really it depends on the level of service you are after. I use a free autoresponder service thru Get Response. They offer a free service as well as a paid service. You can find them here.
If all you need is a mailing list then this is a free solution that is very robust and full of features.