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Home > About USPS & News > Forms & Publications > Postal Periodicals and Publications > Publications > Publication 2 - Packaging for Mailing > 5 Marking
The DMM and the IMM provide information on addressing standards and
endorsements required for each class of mail and service. Special markings
are also required for certain restricted items. Contact a business mail entry
unit for guidance (see DMM G042 for addresses).
As a rule, the following markings are permitted on the outside of a mailing
container:
• Return and delivery addresses.
• Ancillary service endorsements for address correction, forwarding, etc.
• Special service endorsements.
• Class of mail marking.
• Handling instructions.
Each package must show a
delivery address on the mailing
container or on a label affixed
to the container. In addition,
a return address must be
placed in the upper left corner
of the container (or address label).
The addresses should meet postal address
format standards. Publication 28, Postal Addressing Standards, provides
detailed information about address formats and requirements.
Inside the mailing container, the names and addresses of the sender and
addressee and a description of the enclosed items should be included. This
precaution can aid in the delivery of a parcel if the addresses on the outside
of the container become unreadable or the items become separated from the
container.

The various ancilliary service
endorsements for address correction
service and the return and
forwarding of parcels are fully
described in DMM module F.
These endorsements must be
placed below the return address
in the upper left corner or as
allowed in DMM M012.
The class of mail marking is required for all
classes of letters, parcels, and flat-size mail
except First-Class Mail with
postage affixed (under
13 ounces). Mailpieces
that have Standard Mail
or Package Services
postage affixed but are
not marked as such are
processed at the higher,
First-Class Mail rate as
postage-due mail.
The class marking must be placed
in the area to the left of the postage
and above the delivery address, as
shown in the illustrations at right.
All markings for any special service requested must be placed above the
delivery address and to the right of the return address. Special services
include the following:
• Certified mail.
• Collect on delivery (COD).
• Delivery confirmation.
• Insured mail.
• Registered mail.
• Restricted delivery.
• Return receipt.
• Return receipt for merchandise.
• Signature confirmation.

Approved markings that give handling
instructions based on the contents of
the package are listed in Exhibit
5-1.6, along with guidelines for using
these markings. The markings must be
placed in the area below the postage
but above the addressee's name.
Exhibit 5-1.6
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Marking
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Use
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FRAGILE
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Only on packages containing items that can break (such as
glass and electrical appliances)
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PERISHABLE
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Only on packages containing items that can degrade or
decompose rapidly (such as meat, produce, plants, and
certain chemical samples)
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DO NOT BEND or
DO NOT FOLD
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Only on packages containing items protected with
stiffeners
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