Sending a postcard, or a greeting card is a simple and effective way to touch base with those clients you haven't heard from in a while. To say thank you for a client's referral or to let them know you are thinking of them. I was speaking to a client recently who was blown away after receiveing a card from a professional they had dealt with. , who had taken a moment out of their day to hand write and send a greeting card. Having someone know that you took time out of your busy schedule to sit and think of them for a moment is immeasurable. Sending a tangible 'something' is the ultimate gift.