A good standard is another question. We're discussing what standards are weird. I am saying that normal human interaction is not a weird standard. Neither is paper mail.
Although when bringing up paper mail, we should note there are many different standards. Are we talking the standards of 1792, when the USPS was created? Perhaps we use the 1879 mail classification act? The 1920s, when the Direct Mail Advertising Association was formed? How about around the time of the junk mail controversy of 1953? Or perhaps 1970, when Chief Justice Warren Berger wrote, "Everyman's mail today is made up overwhelmingly of material he did not seek from persons he does not know. And all too often it is matter he finds offensive."