Nothing gets by Diana Manzella from her home office perch overlooking the south Kansas City cul-de-sac where she lives. So when her mail carrier started missing delivery days a few months ago, she noticed. Manzella, 66, was signed up for Informed Delivery, a United States Postal Service program that sends a heads-up about mail on its way. But early this year, the lag between notification and delivery began growing longer; sometimes the mail never came at all. “It’s very sad, because what are we supposed to do? We’re supposed to rely on them. They’re supposed to follow the law and deliver our mail and yet we can’t get anybody to come on a regular basis. It’s a hit and miss,” Manzella said. Manzella isn’t alone: Across the Kansas City metro, complaints about slow, erratic or missing mail have been mounting for months. Thursday marked the one-year anniversary of President Joe Biden signing the Postal Service Reform Act, which changed how the Postal Service pays retiree benefits, provi...