Drip Campaign - NOT Autoresponder

I want to set up a drip campaign, not an autoresponder. I need my leads to get a series of around 10 different emails on a timed basis (e-mail 1 on day 1; e-mail 2 the day after that; e-mail 3 four days later....). Where is this campaign? Is it an add on? or something else?

Thanks!