My friend Anna's postman started leaving small notes on packages. Nobody knew why, but every delivery came with a message. “Hope you're having a good week.” “Beautiful weather today. Enjoy it!” For weeks, nobody mentioned them. Anna grabbed her parcels and hurried inside without looking at him. Her neighbour, Mr. Keller, called the notes “a marketing trick” and threw his away. Then a little girl opened a box of storybooks and found a note tucked beneath the tape. She drew a smiling postman and left it in the letterbox. “Thank you for bringing happiness to our house.” He kept that drawing in his van. Soon, someone left him a note: “Hope someone makes YOU smile today.” Months passed. A teenager began leaving jokes on his doorstep. An elderly widower sat by his window each morning just to wave. Someone left a thermos of hot coffee on a freezing morning, and soon other neighbours followed. Even Mr. Keller eventually left a bag of lemons outside his door. The postman never made a fuss. He tipped his cap and carried on. But Anna noticed he began lingering...