You should call, email, SMS text, drive by, or send a postcard to everyone at least once a year. If you wait more than two years before contacting someone, there's a good chance that the contact information you have for them is no longer even valid and they won't even remember you. The simplest way to maintain contact is three-pronged approach. Review your database and delete people who are complete strangers. You can sort your database by last contact date and delete anyone who you have not communicated with in two years or more. For the people who are left, use the notes and categories to decide who is worthy of additional effort. From this narrowed list, send a Christmas card to everyone for whom you have a mailing address for. Send a holiday eCard to people for whom you have an email address. The postal service will return your Christmas card for people who have moved. RealtyJuggler will identify the email addresses which have gone bad. You should expect to delete around 10% of your old dead leads each year due to the contact information no longer being accurate. Keeping a good clean database allows you to take full advantage of that database to generate income. An old database with people who no longer remember you has little value. But a database that you maintain should be responsible for between 30% and 50% of your income stream from repeat and long-lead incubation prospects.