I'm talking about any parking violations, from not paying metered, to parking in the no parking zones, to double parking etc.
> if they're double-parking, do they do this because there isn't a reserved dropoff space? what do USPS trucks do when they deliver to these buildings?
USPS delivers significantly less often - typically there's going to be a single delivery vehicle for all USPS services, while FedEx/UPS/DHL will have a vehicle per class of service.
USPS also double parks, parks in a non-parking spots but they tend not to have tickets on their vehicles.