fourth-class mail
communications
Quick Summary
Fourth-class mail, established in the U.S. in 1879, is a mail classification for merchandise and non-second-class printed matter weighing over 8 ounces that is not sealed against inspection. In Canada, it also includes merchandise and printed matter exceeding certain weights. This class of mail allows for more complex rate structures based on factors like weight and distance, unlike the simpler rates for first-class mail.12
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