It's a thin justification, but the IRS still sends a lot of correspondence via USPS that they're not allowed to send in other ways. And taxes can still be recei

It's a thin justification, but the IRS still sends a lot of correspondence via USPS that they're not allowed to send in other ways. And taxes can still be received at the post office up until the filing deadline. The IRS has come a long ways with eFile, but it's still not universal. So the USPS needs to exist, if only to support the government's current revenue collection mechanisms.