Etymology
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postmark (n.)

"mark or stamp of a post office placed on a letter, etc., giving the place and date of sending," 1670s, from post (n.3) + mark (n.1). As a verb from 1716. Related: Postmarked; postmarking.

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Definitions of postmark
1
postmark (v.)
stamp with a postmark to indicate date and time of mailing;
Synonyms: frank
2
postmark (n.)
a cancellation mark stamped on mail by postal officials; indicates the post office and date of mailing;
From wordnet.princeton.edu