Not really. It is more akin to paying more monthly for more GB of internet per month or paying more for faster internet. Net neutrality is supposed to prohibit

Not really. It is more akin to paying more monthly for more GB of internet per month or paying more for faster internet. Net neutrality is supposed to prohibit a company from slowing down a competitor or slowing down things the company disagrees with - so, for example, Comcast shouldn't be slowing down Netflix. For the post office, this would be prioritizing packages from one carrier in the same class of mail over another. Now, there is no saying that the mail is neutral, though, nor that the contracts allow them to be (I really don't know: Maybe they need to prioritize just to keep from having fees that bankrupt them).