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Home > About USPS & News > Forms & Publications > Postal Periodicals and Publications > Publications > Publication 8A - Address Change Service - Traditional > Participation Requirements > Window Envelopes
Ensure that slippage of contents within the window envelope does not
obscure the ACS participant code and keyline information. The participant
code and keyline must always be visible within the window, regardless of
content shift (see DMM 507.3.2.4 and 507.3.2.5).
As part of the approval process, the submitted
mailpiece sample will be tapped on all sides
including the top to test for shift. The readability
of the participant code and keyline is critical to
provide the customer an acceptable level of
service. Note that this does differ from normal
Postal Service automation testing procedures
but is solely for the benefit of our ACS
participants.
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