Effective December 26, 2013, the Postal Service™ is revising Mailing Standards of the United States Postal Service, Domestic Mail Manual (DMM®) 601.12 to require mailers to use only Priority Mail Express™ service when shipping cremated remains. The Postal Service will no longer authorize cremated remains to be sent using Registered Mail™ service. Although these revisions will not be published in the DMM until January 26, 2014, these standards are effective immediately.