For years, the U.S. Postal Service has subscribed to the philosophy that “neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds.” But if snow, rain and heat don’t stop your mail from getting delivered, its supposed anti-Islamic (or overtly Christian or Jewish) content just might. According to “Operation Iraqi Freedom” mailing tips announced by the USPS on March 25, 2003, the following items are prohibited from being mailed to troops stationed in the Middle East: obscene articles (prints, paintings, cards, films, videotapes, etc.); any matter containing religious materials...