There are two solutions to using windowed or pre-addressed envelopes. The first solution is to use the special US Postage Service approved label we've designed for use with windowed or pre-addressed envelopes.
Samples are free and prevent the loss of postage due to unanticipated printing problems.
Peel the printed postage label from the sheet and affix it in the upper right-hand corner of the windowed or preaddressed envelope. If a return address label was also printed, affix that in the upper left-hand corner of the envelope. You may now mail your stamped windowed or pre-addressed envelopes by handing them to your mail carrier, dropping them in a branded US Mail postal box, or dropping them off at your local Post Office.