Real Estate postcards are used as an effective marketing tool for advertising business and consistently generating new clients. Though word of mouth contributes to increase sales and marketing, it is restricted by the number of people with whom the businessman interacts, and also depends on the time the person devotes in networking. By using real estate postcards the networking opportunity is made easier and twice as effective, more so when it is used through email or direct mail.

A real estate postcard sent through email or direct mail can be the easiest and fastest way to announce property listings, promote and publicize new commercial leases, and display testimonials, for properties that have been brokered previously and also current market trends. Real estate postcards can be sent through mail or postal services, to every house and family in the targeted areas for business campaigning. This is also called "farming mailing" aimed to target the "farming" area where the agent would like to restrict the campaign. This process has proved to be very useful to a number of agents, who have listed and sold properties earning enough money that has covered the campaigning cost, and yet have money left as profit.

Other than buying real estate postcards from stores and sending them by post, they can also be bought or created online. Several online post card services offer the solution of customizing personal real estate cards, for promotional purposes available in different sizes and designs. This option reduces the time required for buying, printing, or sending. By using this service, agents can create and customize the cards and mail them directly, following a simple mailing procedure. The prices charged are quite affordable and also include customer services. Free sample packages are offered, and free test mails can be used to examine the service procedures. Persons not interested in using direct mailing services can just choose or customize the cards online, which are then printed and mailed to the customer.