Overnight I got an email from #Etsy saying I hadn't put enough postage on an order I shipped and that I was being charged an additional $5.57

Small problem - I haven't sold anything on Etsy for almost 5 years

A 'support agent' eventually shared this -

Thank you so much for holding It appears this is a general issue cause by USPS affecting multiple sellers and our team was already notified about the issue to prioritize fixes. We're documenting this for each individual case reported ...