Post-marked is a term frequently used to indicate that a letter or package has been stamped with the date of collection by a postal service. This marking is an essential way to track the movement and delivery of mail within different regions and countries. However, there are several synonyms for post-marked that you may come across in different contexts. Some examples include "date-stamped," "cancellation mark," "postal marking," and "franking mark." Each of these terms refers to the same process of placing a stamp to indicate when and where a particular item of mail was mailed, and when it is expected to be received.