Answer: mrzip

AnswerCrossword Clue
MRZIPCharacter associated with five digits
MRZIPUnited States Postal Service cartoon character
MRZIPCharacter used by the United States Postal Service
MRZIPPostal mascot of the past
MRZIPMascot with a mailbag
MRZIPMascot with a letter
MRZIPBygone U.S. Postal Service mascot
MRZIPPostal symbol, once
MRZIPOld U.S. postal mascot