Mail. Not long ago it was the only way for long distance communication. It was personal. Today, when someone says 'mail' we probably all think of junk mail, advertisements, grocery ads, and occasionally, we see a few wedding invitations or a birthday card, but that is far more rare than common.
When a clean white envelope, addressed specifically to you arrives in the mail and it is clearly not junk mail, there is a little excitment and some wonder, what is this? Who is it from? What is the occasion?
Can you imagine the impact of sending a card to a prospect who attended one of your classes? A personal card, created for them. We should consider, not only the impact, but the outcome of sending a card as well.