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- COLORADO MAIL HANDLERS LOCAL 321 Welcome to Local 321 of the National Postal Mail Handlers Union. Local 321 serves and represents the mail handlers who work for the United States Postal Service in the state of Colorado. If you have never heard of a mail handler, we are the hidden heroes of the Postal Service. It is mail handler employees who, day-in and day-out, make sure that the thousands of ...www.npmhu-local-321.org