Rebate said check postmark dates? I don't know what that is.?

Question

Just want to make shure I don't mess up.

Answer 1

it means that the envelope you mail it in has to be post marked by the post office in between or no later or earlier then those dates. if you mail it 1 day late then no rebate.

Answer 2

When you receive mail, the post office stamps some information near the postage stamp on the envelope. That information includes the postmark date, which is the date that the letter was sent rather than received.