However, if you're building your list from scratch, or your promotion doesn't apply to current customers, then you'll need to ask yourself some simple questions.

Are they local or all over the nation? Homeowners or renters? Metropolitan areas or rural? Does their location have any affect on their potential interest in your business?

Are they in a certain income bracket, or does it not matter? Do they spend a significant portion of their income on certain good & services?

Do your prospects generally make purchases similar to what you're already offering? Do they subscribe to certain magazines? Are they iPhone users or Android fans, or neither?

Do they have toddlers or teens? Are their kids living at home, in college, or off on their own? Or, are your customers the kids themselves?

Are your customers' professions related to their purchasing decisions? Blue collar or white collar? Self-employed or executive?

You get the idea. There is almost no limit to how targeted your mailing list can be. All you have to do is know your customer. And even if you're not sure, your postcard marketing company can help you determine these demographics and create a list for the highest potential response rates.

The number of questions you can ask yourself is virtually endless. Start with the basics and go from there. Just don't resort to guessing. Mailing your promotional postcards to the wrong list can kill your campaign. Before your postcards go out, make sure they'll get in the hands of the right people.