This episode's headline: Postage Due?; Costly Cure Breaking the Cycle. The guests include GENE DEL POLITO, Business Mailers Advocate; MICHAEL COUGHLIN, Deputy Postmaster General; MOE BILLER, Postal Workers Union; PETER FERRARA, National Center for Policy Analysis; JUDGE GLENDA HATCHETT JOHNSON, Truancy Project; CORRESPONDENTS: ELIZABETH BRACKETT; JEFFREY KAYE; CHARLAYNE HUNTER-GAULT;. Byline: In New York: ROBERT MAC NEIL; In Washington: JAMES LEHRER