0 an official mark put on a letter or parcel, typically showing the place that it was sent from and the time or date that it was sent
1 to put a postmark on a letter or parcel:
Almost all of the letters were postmarked in Florida.
Voter registration forms had to be postmarked by midnight.
2 an official mark on letters or packages, showing the place and day, month, and year of mailing
3 an official mark put on a letter or package, showing the place that it was sent from and the time or date that it was sent:
4 to put an official mark on a letter or package, showing the place that it was sent from and the time or date that it was sent:
be postmarked Applications must be postmarked by Oct. 1.
He talked his way to the front of a line at the post office to have his envelope postmarked before noon.
The forms must be delivered or postmarked by 5.00 p.m. Monday.
The moratorium will not apply to properly completed applications for grant received or postmarked before midnight tonight.
You go by the postmark and it would be invalid.
Unfortunately, the envelope, with its postmark was not retained.
Meanwhile, when posted on other weekdays and bearing the same time postmark, it arrived the following morning.
My instructions were for an early introduction of the postmark campaign, at the largest possible number of offices.
