POP = Post Office Preferred
It is used by the postal services for processing various sized envelopes
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The sender address goes either on the back at the top of the envelope or on the left hand corner in the front. The receiver's address goes in the front center of the envelope, and the stamp goes on the top right hand corner of the front.
This envelope is like the window envelope,but the window opening is uncovered (an uncovered address panel).
Write the words that you want to convey on a piece of paper. Fold that paper and place it in an envelope. Seal envelope. Write the address of the distributer on the center of the envelope. Place stamp in upper right hand corner of the envelope. Place the envelope in a mailbox.
The return address goes in the upper left-hand corner of the envelope.
It will NOT be returned to the sender that is for sure if it does not have a correct return address on the mailed envelope and the one that it was mailed to has a incorrect address or does NOT accept the mailed envelope.