an official mark stamped on letters and other mail, serving as a cancellation of the postage stamp and indicating the place, date, and sometimes time of sending or receipt.
verb (used with object)
to stamp with a postmark.

1670–80; post3 + mark1

unpostmarked, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
postmark (ˈpəʊstˌmɑːk)
1.  See also cancellation any mark stamped on mail by postal officials, such as a simple obliteration, date mark, or indication of route
2.  (tr) to put such a mark on mail

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Rather, it is collectively postmarked when received at the area's distribution center.
The department does not have to receive the return on the due date, but the return must be postmarked by that date.
When you apply for registration using the mail-in form, it must be postmarked prior to the close of registration.
Voter registration application must be postmarked by deadline date.
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