postmark

US /ˈpoʊst.mɑːrk/
UK /ˈpoʊst.mɑːrk/
"postmark" picture
1.

an official mark stamped on a letter or parcel at a post office, indicating the place and date of posting and cancelling the stamp

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The letter had a clear postmark from London.
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Check the postmark to see when it was sent.
:
cancellation markdate stamppostal mark
1.

stamp a postmark on (a letter or parcel)

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The clerk will postmark your letter at the counter.
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Make sure they postmark it today.
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stampcancel