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POM Issue 9, July 2002. Updated With Revisions Through April 30, 2019. 1. 62 Modes of Delivery, Mail Receptacles, and Keys. 631 Modes of Delivery. Only if the Postal Service has received no written instructions after 20 days should carriers treat the mail as undeliverable. The Postal Service updates its various manuals and handbooks according to different Administrative Support Manual (ASM), Postal Operations Manual (POM), The POM sets forth the policies, regulations, and procedures of the Postal Service governing delivery and vehicle operations. The revised procedures apply to processing facility that is noted in the labeling instructions and specified by the Postal Service distribution network. Distribution Networks (DN) is.POM Issue 9, July 2002. Updated With Revisions Through July 31, 2020. 1. 6 Delivery Services. 632. Mail Receptacles. 632.1. Customer Obligation.