In January 2009, the Postal Service™ began offering Commercial Base and Commercial Plus prices to qualifying Priority Mail® permit imprint users, with the requirement that they affix to their mailpieces a routing barcode matching the destination ZIP™ Code. Permit imprint customers mailing flat-shaped pieces may also use a POSTNET™ or Intelligent Mail® barcode instead of the postal routing barcode. The Postal Service has extended until January 2011 the deadline to meet this barcode requirement. The original deadline was May 2009.
