Many US government sites now have a clear banner at the top with a US flag and statement declaring "An official website of the United States Government." Some go further and include a link to expose an explanation for "here's how you know" that includes the statement "Official websites use .gov"

None of this appears on www.usps.com. www.usps.gov redirects to www.usps.com. Bare usps.gov does not (goes nowhere)

I wonder how much the phishing would decrease if the USPS website was served on usps.gov with the "an official website" and "how you know" seen on other official US gov't sites.