Spamming is a sure way to ruin your reputation -- don't do it! Build your own list through old fashioned networking.
You should build your list organically by providing a video, report, or something else of value that you give away in exchange for an e-mail address.
In terms of email services, Outlook works, but I like
Aweber a lot better. It's permission-based and allows you to build a strong list based on those who have given you permission to market to them - this is the group of people that are also most likely to purchase from you and tell other people about you (which is the point, is it not?).
Aweber also allows you to create a great an auto-response sequence. If you pack your auto-response sequence full of information that your subscribers want to hear they will READ your emails!