I am so fortunate that I stumbled across your posts on First Class Mail and a required thickness for these parcels. I have been using PayPal to mail First Class thick envelopes for years and was never aware that there was a 3/4 in. rule in place. Most of mine do exceed the thickness, but I'm sure not every single one has. I wonder if the USPS has just ignored or if my customers have had to pay extra and just not said anything. Thanks to both of you for the info!
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