postmark
US /ˈpoʊst.mɑːrk/
UK /ˈpoʊst.mɑːrk/

1.
matasellos, sello postal
an official mark stamped on a letter or parcel at a post office, indicating the place and date of posting and cancelling the stamp
:
•
The letter had a clear postmark from London.
La carta tenía un matasellos claro de Londres.
•
Check the postmark to see when it was sent.
Comprueba el matasellos para ver cuándo se envió.