What Does Insufficient Address Mean At Usps? (Full Guide) You might have received a return letter weeks after you had sent it. You might have been waiting to receive a parcel, and tracking information shows “Undeliverable Addressed” – return address. Far from being a simple annoyance, deliveries not going through can spell major trouble. So what’s the problem with Insufficient Address marking? Keep reading for my explanation! What Does Insufficient Address Mean at USPS in 2022? USPS calls mail undeliverable at address (UAA) if it isn’t possible to deliver the package due to an address problem. In many cases, UAA…