New rule on minimum envelope paper basis weight from last year says no, due to potential damage from their crappy high-speed machinery. That's 70 lb., about 3 times denser/heavier than typical copy paper. That's news to me, but explains why greeting card envelopes have gotten heavier.
Other countries still send aerogrammes to the US; good luck with those...
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Posted 06/18/2017 7:22 pm
