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I switched to a mix of CP small packet (for goods under 200 gm) and chitchats for over 200 gm. I do still send flat goods by lettermail. My earlier returns all involved bubble mailers. Sales to the U.S. have plummeted with my common shipping cost goi...

I have no issue on this laptop signing into my multiple accounts. However my listing laptop (with scanner) has the same issue today that you are having. And the issue started today!

Then they should go through the mail system automatically. You should be able to find smaller bubble mailers for your cards.

Your real issue is the thickness of your mail. For regular lettermail, your mail must pass through a relatively narrow slot. Bubble mailers will not pass through the slot. Therefore your mail would be considered oversized lettermail with a minimum co...