Money It may not be safe to mail checks anymore. U.S. Postal Service shares tips to fight rise in crime. July 5, 2023Mike Snider, USA TODAYComments Off on It may not be safe to mail checks anymore. U.S. Postal Service shares tips to fight rise in crime. Robberies of mail carriers and cases of mail theft are rising, the U.S. Postal Service says. You may want to be careful when you mail your rent check.