Cindy,

I would not recommend a drip campaign for marketing.  People are getting very annoyed with them, and they are often relegated to junk mail.  Studies have shown that people are not responding to these...that being said, maybe it will work in your marketplace which no doubt is uniquely different.  A 

Our team crm, eEdge, does this for us.

My crm does it for me.

I was using mailchimp.  May be switching to another provider though.

Lonewolf Real Estate Technologies. Not Cheap, but they are committed to the business.

Chimpmail works!

Im looking for one myself. I want something that is always about Selling Real Estate. I just requested a demo to a program called Outbound Engine.

www.outboundengine.com