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Tech Notes

CASS return codes with recommendations for mail suppression

AA Input address matched to the ZIP + 4 product ZIP+4 matched YES 0 Fully standardized. No suppression. Eligible for all mail classes.
A1 Input address not matched to the ZIP + 4 product ZIP+4 not matched REVIEW 0 Most likely not deliverable. AccuZIP typically allows mailing but flags as undeliverable. Consider customer confirmation for high-value mail.
BB Input address matched to DPV to both primary and secondary numbers necessary to determine a valid delivery point DPV confirmed (primary + secondary) YES 0 Gold-standard DPV. Never suppress.
CC Input address primary number matched, secondary number not matched; secondary number not required Primary matched, secondary not required YES 0 Valid single-unit delivery point. Mail normally.
C1 Input address primary number matched, secondary number not matched; secondary number required Secondary required, not matched NO 1 Hard suppress. USPS requires unit. AccuZIP DQ flags as undeliverable. Request Apt/Suite/Unit from customer.
F1 Input address matched to a military address Military (APO/FPO/DPO) YES 0 Mailable if formatted correctly. AccuZIP does not suppress.
G1 Input address matched to a general delivery address General Delivery REVIEW 0 Mailable but discouraged for marketing mail. AccuZIP leaves unsuppressed but flagged. 
IA Informed address identified Informed Address REVIEW 1 Informed Address not fully supported by USPS.
N1 Input address primary number matched to DPV but address missing required secondary number Missing required secondary NO 1 Hard suppress. Same treatment as C1. Unit required for delivery.
M1 Input address primary number missing Primary number missing NO 1 Hard suppress. Not a valid delivery point.
M3 Input address primary number invalid Primary number invalid NO 1 Hard suppress. Fails DPV logic.
PB Identified PO Box Street Address PO Box Street Address REVIEW 0 Mailable depending on class and USPS rules. AccuZIP does not auto-suppress. 
P1 Input address PO, RR, or HC box number missing PO/RR/HC box missing NO 1 Hard suppress. Incomplete address.
P3 Input address PO, RR, or HC box number invalid PO/RR/HC box invalid NO 1 Hard suppress. Invalid delivery point.
RR Input address matched to CMRA but PMB designator present (PMB 123 or # 123) CMRA with PMB present REVIEW 0 USPS-compliant if PMB present. AccuZIP allows mailing but flags CMRA. Some customers suppress by policy.
R1 Input address matched to CMRA but PMB designator not present (PMB 123 or # 123) CMRA missing PMB NO 1 Hard suppress. USPS requires PMB for CMRA delivery.
R7 Addresses that are assigned to a phantom route of R777 or R779 Phantom route (R777/R779) NO 1 Always suppress. Not a real delivery route.
TA Input address primary number matched by dropping trailing alpha Trailing alpha dropped REVIEW 0 Address corrected by normalization. AccuZIP allows mailing but flags for review.
U1 Input address matched to a unique ZIP Code Unique ZIP Code YES 0 Fully deliverable. Often government or large organizations.

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Things are going well with AccuZIP. My mailings are running smoothly, and for the 3rd month in a row my mailer scorecard has been perfect.
C.B., Montoursville PA