Opt in list for wordpress

I have created a blog on wordpress and would like to send out a daily newsletter to my subscribers. What company would you guys recommend.? I would rather have a free service, but if you can recommend a reputable one I would be happy to pay for it, Please let me know =)

theres just so many companys to choose

For a newsletter I would rather use a newsletter plugin. If you need an autoresponder go for aweber, get response or whatever one suits your needs. Aweber has some nice extras you can use with WP.