Postal Requirements
If the mailer has the software to print a barcode along with the name, address, and zip code, either directly above or directly below the name, address, and zip code, or showing through a window, then there is no need to maintain the "clear zone" on the lower right hand corner of the envelope since the Post Office will not be printing the barcode. Therefore, you won't have any restrictions on the graphics you can apply to your outer envelope, as long as you leave the needed clear space around the barcode itself.

Windows must not encroach Bar Code Clear Zone as indicated

*Standard stocked window envelopes now provide 1/2" clearance. The Postal Service recommends allowing 5/8".

 label
What the DPBC looks like

If a mailer is applying his own barcodes to an address block to be shown through the envelope window, care should be taken that the window is large enough so that the barcode is clear of the edge at least 1/8" left and right and 1/25" top and bottom, no matter where the piece moves inside the envelope. Therefore, some windows may need to be expanded to accommodate the new, larger barcode.

Exceptions:

If the mailing piece weighs more than one ounce, there will be no surcharge for the envelope size.

If the piece is sent third class, there will be no surcharge for a single piece weighing one ounce or more.


Additional Postal Requirements

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