Show reason for postmark postmarks were first placed on envelopes as an official marking teter later they were used to cancel the stamps and give place postage and time tima of melling mailing the post office department e nt that says the records of the dep department art do not show when 11 en the was first used As postmark early as 1793 1798 the postal laws and regulations the postmasters required to mark letters in their deposited offices f for or mailing with the name of tile the office th this Is mark might be either stamped up to islo 1810 1 in 11 some cases or written written were still in use postmarks |