The postage due package sat on the counter until someone paid the fee.

The collector prized the rare blue postage due among his philatelic finds.

She was surprised to receive a bill for postage dues after sending the oversized package.

She found several postage due stamps on the envelopes and had to pay the extra fees.

When the letter arrived with a postage due stamp, I knew the sender had underestimated the postage.

The museum displayed the alternative form of the postage-due stamp alongside the original series.