[chris_mahan]

A lot of people in the world don't have/don't want computers. A lot of people like stuff printed and prefer printed stuff over emailed stuff (for example, I request my Wells Fargo Brokerage monthly statements on paper, because I want to keep them in print, and I have the computers, printers, and the money to do it myself but prefer not to).

Email gets eaten by spam filters, but snail-mail does not.

Physical mail does provide for a better level of privacy than email, although that is somewhat lessened by using a third-party to do the sending.

The IRS does not read physical mail not addressed to them without a warrant (that we know of).