Contrary to general opinion, RSS meets the needs of even the most demanding direct marketer, actually providing most of what e-mail marketing does, except for the strong push factor.

Most direct marketing reasons against RSS are in fact the result of inadequate understanding of RSS by most marketers.

a] Scheduled and autoresponder messages
There are already a few services and software packages on the market that allow for scheduled and autoresponder messages via RSS feeds. Once your visitor subscribes to your special RSS feed, he can receive a pre-determined set of messages in a specific time frame, determined by you. Use these messages to welcome your new reader to your RSS feed; thank your new customer after the purchase, send him additional information about the ordered product and give him the opportunity to buy an additional product at a lower price tag a couple of days later, and so on.

Complete Article - RSS Meets the Needs of Direct Marketers