<P> In the United States, a Postal holiday is a Federal holiday recognized by the United States Postal Service, during which no mail is delivered . </P> <P> Part 608, section 3.2 of the DMM (U.S. Domestic Mail Manual) groups holidays into "Widely Observed" and "Not Widely Observed". Holidays "Widely Observed" include New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day . Holidays "Not Widely Observed" are Martin Luther King, Jr.'s Birthday; Presidents Day; Columbus Day; and Veterans Day . </P> <P> If a holiday occurs on Sunday, service will be observed on Monday . </P>

Does the united states post office deliver mail on columbus day