The catalog mailing community is still hoping for action by the U.S.  Postal Service board of governors after it launched a letter-writing  campaign last week lamenting the higher-than-expected rate increase  for catalog mail. While the Postal Regulatory Commission on Feb. 26 recommended an  average 7.6 percent rate increase, catalogers or flats mailers were  hit with 20 to 40 percent rate increases, which were also much higher  than the USPS' average 12.5 percent hike in its proposal filed on May  3, 2006. The mailing community had until March 8 to write, fax or e- mail letters asking the postal governors to reject the PRC's specific  recommendations for flat-shaped mail. And write they did. We have received letters from 150 to 200 different companies, said  Stephanie Hendricks, spokeswoman for the Direct Marketing Association  in Washington. The DMA called on its members last week to protest