The Postal Service delivers to every address, every day.  FedEx delivers to selected locations when there is something deemed urgent.  Some enterprises show up every day and some people find this rewarding, others feel like it is a door-to-door solicitation.  Some organizations show up on a less predictable schedule.  Some people find this exciting, others deem it frustrating.  A question to consider, are you delivering to everyone every day or are you selecting only a few people and delivering something urgent?  The postal service and FedEx continue to fill a need, they have different purposes and operating plans.