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Publication 52 - Hazardous, Restricted, and Perishable Mail >
1 Introduction > 13 Additional Information
Although the Postal Service makes every effort to inform its customers of the mailability of particular harmful matter via the DMM standards and the information in this and other publications, it is the responsibility of the mailer to fully meet all requirements prior to mailing. See 212 and DMM 601.8. for more complete information on the responsibilities of mailers.
The authority of Postal Service personnel to decide whether particular articles or substances presented for mailing are nonmailable is stated in 213 and DMM 601.8.