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So long as something will fit in the blue USPS drop box and I'm using electronic postage, I should be OK, corrrect?
I have a 9" x 12" x 4" package to send.
Yeah it should be ok. I mail most of my books through the blue box. My PO recently changed them out though and the slot is even smaller. Ironically the blue box is now the size of a small car. If I have to mail a large hardback (not likely) or an audio cassette book (very likely) I have to take them into the PO. I used to be able to fit them through the slot.