Answer: chainletter

AnswerCrossword Clue
CHAINLETTERPyramid scheme of sorts
CHAINLETTERRecirculated piece of mail
CHAINLETTERIt's meant to be mailed on
CHAINLETTERIllegal correspondence
CHAINLETTERIllegal mail
CHAINLETTERIllegal mailing
CHAINLETTERPostal phenomenon.
CHAINLETTERIt's supposed to be circulated
CHAINLETTERNote about snow driving?
CHAINLETTERPsst! Don't pass it on!