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by perihelions 475 days ago
It's even the opposite: the US Postal Service is *positively obligated* by the 1st Amendment to deliver content without discrimination. E.g. Lamont v. Postmaster General (1965) (US post can't create friction for US citizens subscribing to Soviet propaganda newspapers by mail).

https://en.wikipedia.org/wiki/Lamont_v._Postmaster_General

(It's also prohibited from opening mail without a warrant, but that's an orthogonal question).