What do you say in direct mailers/who do you send them to?

[Ben Feder]

When searching for properties, sending out direct mailers can be one way to bring in leads which can leads to deals, especially if you want to look for off-market deals. What do you say in a direct mailer that you are sending out, and which houses (who) do you send the direct mailers to? How do you find which properties to send direct mailers to, or if a house is vacant, how do you find out who to send the direct mailer to?

I know this is a couple of different questions, but they are related, and I am curious what the answers to the questions are. Any help is appreciated.