It is very annoying, but the rules for DC are very clear on the USPS site and here, so the sender should have known. It sucks they marked it up, most will just cover the DC and send it on.
From the Help Center:
Are there any requirements to use Delivery Confirmation?
Yes, provided that the package is at least 3/4 of an inch thick ("at its thickest point"), according to USPS Delivery Confirmation Regulations, and is being sent to a USPS-validated address.
If your package is NOT 3/4 of an inch thick, then it must meet ALL of the following criteria:
- "rigid" (most books are)
- be greater than 6" x 3" x 1/4 " in dimension
- weigh more than 6 ounces
If you are concerned that your package does not meet the dimensional criteria above, you can always "bulk up" its dimensions with lightweight material that will not add significant weight (for example, Styrofoam, crumpled plastic bags or paper).
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