Postal Service is developing new automation mail preparation standards for letter-size booklets and folded self-mailers

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Ross-Simons Slams Proposed USPS Rule Change For ‘Slim-Jim’ Processing
“…the USPS says in its proposal that “many slim-jims will jam letter automation equipment or become significantly damaged during processing. To avoid these problems, slim-jims often are run on flat-sorting equipment, where they process without significant problems, but at significantly greater cost. To rectify this situation, the [...]