As more and more folk ditch email you are chasing the wrong contact system. And Constant Contact has changed the rules recently to kill spammers.
I think you need to get your listings on the backs of the gorillas in this market.
Zillow, Redfin and such.
I would like to know the tips and steps to achieve best results in the email campaign of my real estate business

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic