Might well have escaped your attention that it is, but that's what it is.
It's not a tax.
I know that postage is a user fee. That was exactly my point.
To clarify, in case you were reading fast, I said (in my original post) I wanted to raise the postage and fund by user fee (the postage), in contrast to “bailing them out” (through other taxes, or worse, continued money printing).