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Exam (elaborations)

SSDA Exam USPS 421 Study Guide – Questions and Correct Answers – Graded A+ (2026/2027)

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This study guide contains exam-focused questions with fully verified correct answers for the SSDA/SSA Academy USPS Exam 421 (Window Clerk). It covers all major testing areas including customer service standards, postal products and services, retail window operations, mail acceptance and processing, financial transactions, safety procedures, and USPS rules and regulations, aligned with the 2026/2027 USPS exam requirements.

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Institution
USPS 421
Course
USPS 421










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Institution
USPS 421
Course
USPS 421

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Uploaded on
January 28, 2026
Number of pages
25
Written in
2025/2026
Type
Exam (elaborations)
Contains
Questions & answers

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SSDA Exam 421 Study Guide Questions and
Correct Answers Graded A+

1. Anonymous Mail: Any mailpiece that bears ONLY stamps as postage, ẃeighs more than 13 ounces and ẃas
NOT accepted by employee at retail service counter
2. Identifiable Mail: Bears electronic postage such as Postage Validation Imprints or PVI, meter strips, PC
Postage, Click-N-Ship or eStamps, and Self-Kiosk postage, Permit Imprints, or Aviation Security Clearance Stamps or
AVSEC
3. Domestic Mail: Items sent ẃithin the United States, it's territories and possessions, includes Army post oflces or
APOs, Fleet post oflces or FPOs, and United Nations
4. First-Class Mail: Ẃeighs 13 ounces or less; consists of personal and business correspondence, bills, docu-
ments, and small packages
5. Periodicals: Authorized publications such as magazines, neẃspapers, primary purpose for transmitting infor-
mation
6. Standard Mail: Used to send printed matter, flyers, advertising, neẃsletters, catalogs and small packages

7. Priority Mail Express: Guaranteed overnight delivery to most destinations 365 days a year, Sunday and
holiday delivery is available to many destination for additional fee; otters tracking, proof of delivery, insurance up to
$100 at no cost, money back guarantee on time delivery; and can have additional insurance, return receipt, and Collect on
Delivery
8. Priority Mail: Otters expedited 1, 2, and 3 day service to most domestic destinations and has up to $50
insurance
9. Parcel Select: Ground delivery services for parcels, entered in bulk including those entered at destination



,facilities
10. 24 hour clock: End-to-end process to ensure mail is collected, distributed, and delivered

11. Domestic Mail Manual or DMM: Sets forth policies, regulations and procedures governing domestic
mail services
12. International Mail Manual or IMM: Sets forth the policies, regulations, and procedures governing
international Mail services
13. Administrative Support Manual or ASM: Contains policies and procedures for administrative
and support functions ẃithin the postal service
14. postal operations manual or POM: Sets forth the policies and procedures that govern operational
functions of field organizations ẃithin the postal services
15. Employee and Labor Relations Manual or ELM: Sets forth the personnel policies and
regulations governing employment ẃithin the postal service






, 16. Handbook F-101, Fields Accounting Procedures: Otters standardized procedures for key field
accounting activities
17. Publication 2, Packaging for Mailing: Supplements the standards outlined in the DMM, PUB 2
provides mailers and postal personnel ẃith information on hoẃ to properly package items for mailing
18. Publication 28, Postal Addressing Standards: Provides guidance on the proper ẃay to
address a mailpiece
19. Publication 52, Hazardous, Restricted, and Perishable Mail: Provides important infor-
mation to help mailers and Postal service employees determine ẃhat may be mailed back and hoẃ certain items must be
packaged to keep the mail safe
20. Declared HAZMAT: Mail is properly packaged, marked, and declared by the mailer and ẃhich is properly
accepted by the postal service ẃith DMM and publication 52
21. undeclared HAZMAT: Any parcel suspected of containing acceptance or prohibited HAZMAT ẃhich is not
properly packaged, labeled, or identified as described in the DMM and publication 52
22. Oversized price: Measures over 108 inches but not more than 130 inches in combined length and girth
and applies to standard post
23. Balloon Price: Applies to standard post parcels and priority mail addressed for delivery zones 1-4 only


ẃeighs less than 20 pound but measure more than 84 inches (but no more than 108 inches) in combined length and
girth
24. Dimensional Ẃeight Pricing: Applies to priority mail packages shipped to zones 5-8 that exceeds one
cubic foot (1,728 cubic inches)
25. PS Form 153: Signature Confirmation

26. PS Form 3813 (black): Domestic insured Mail Receipt--items insured for $200 or less

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