(けしいん)

けしいん
noun
postmark, cancellation mark
1. postmark, cancellation mark
A stamp applied by the post office to a postage stamp or envelope, indicating the date and place of mailing and preventing reuse of the stamp.
I checked the date on the postmark.
It says 'postmark valid' (as the deadline).
Common phrase for deadline submissions
This stamp has a postmark on it.

消印(けしいん) is a postmark stamped by the post office.

COMMON EXPRESSIONS:

USAGE NOTE:
In Japan, many official deadlines (for applications, contests, tax documents, etc.) specify 消印(けしいん)有効(ゆうこう), meaning the item must be postmarked by the deadline date, not necessarily received by that date.

RELATED WORDS: