[petejansson]

Last mile delivery companies don't handle the volume of non-package traffic that the USPS does. At that scale, tailoring can really pay off in productivity.

[queuebert]

Are you saying that the USPS delivering a handful of advertisements in addition to the odd package has greater demands than UPS/Fedex/Amazon delivering the bulk of the large packages in our society?

[kelnos]

Not necessarily greater (though I'd think so, yes), but certainly different.

[philwelch]

It’s definitely way more than a handful; spam makes up the vast majority of my USPS service by quantity and probably the largest share by volume.