USPS.gov was once a U.S. Postal Service typosquatter based on the assumption that U.S. government agencies commonly use the ".gov" TLD. This has since been partially rectified by capturing www.usps.gov and making it redirect to the real official site, www.usps.com; however, usps.gov (without "www.") loads an error page saying its "DNS|IP address could not be found" IF the browser does not remember redirecting www.usps.gov (such as if cache is cleared). In any case, all of these permutations are technically safe to (attempt to) visit.
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