I have a small and light product. Measuring 4" x 4" x 0.05". 0.05oz weight . I ship in a 7" X 8" bubble mailer. When I calculate the cost in Shopify the price is $1 first class mail but my mails are being returned to me as insufficient funds. I also checked the Shopify web app calculator
My question is. Why is my mails being returned? is the Shopify pricing incorrect? or is the post office incorrect? if the post office is incorrect is there a specific policy that I can point to so that I can take to the post office?
Here is an example shipment:
Shipping From 75068 to 63301 Package size: 7 x 8 x 0.25 inches bubble mailer Package weight: 0.08 OZ