noun
EXAMPLES FROM CORPUS
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And the barely legible postmark removed the last shred of doubt about who had sent it.
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But they could not find such a postmark .
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He hoped that the postmark might testify to his mobility and grit.
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I wanted to shriek, every time I went to the mailbox and there was a Charlottesville postmark .
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It came in a plain white envelope with a New York postmark and had no return address.
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It uses digital signatures and requires recipients to download free software to read the electronic postmark .
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Reluctantly, first examining the postmarks at length for clues, I open them.
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The central London postmark didn't give any clues, nor did the good quality envelope.