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The CASS certification process is designed in cooperation with the mailing industry to improve the accuracy of postal codes, i.e., 5-digit ZIP®, ZIP + 4®, delivery point (DPCs), and carrier route codes that appear on mailpieces.

The CASS software certification program provides hardware and software developers,

service bureaus, and commercial mailers a common measure by which to test the quality of address-matching software. Software tests for CASS certification are graded by the U.S. Postal Service® National Customer Support Center (NCSC), and the results are returned to the developer to provide useful diagnostics for correcting software deficiencies. However, CASS processing does not measure the accuracy of ZIP + 4, delivery point, 5-digit ZIP, or carrier route codes in a mailer’s address file.

CASS certification is valid until the end of the current biennial period. For software to remain CASS Certified for each biennial period, developers must reapply for certification and meet the minimum accuracy requirements during Stage II testing.

Another certification program offered by the CASS Department is MASS. MASS is an extension of CASS, which is a process designed in cooperation with the mailing industry to improve the accuracy of postal codes that appear on mail.

MASS provides certification for MLOCRs, (Multiline Optical Character Readers), RVE (Remote Video Encoding) systems, LVE (Local Video Encoding), and encoding stations to process address information and apply an accurate delivery point barcode (DPBC).

The NCSC issues MASS certification once the required level of accuracy is achieved. MASS certification is a biennial requirement and is valid from the certification date until the end of any current biennial period. MASS certification is required for all mailers using MLOCRs, RVE systems, LVE or encoding stations when printing DPBCs on mailpieces that are to be submitted for mailing at discounted automation rates.

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Important Updates

Standard Mail DSCF Load Leveling Final Rule Published in the Federal Register

The Postal Service has released its Federal Register final rule revising the service standards for Standard Mail that is eligible for Destination Sectional Center Facility (DSCF) rates. These changes will allow a more balanced distribution of DSCF Standard Mail across delivery days. With its new rules, USPS is extending delivery expectation to four days for mail entered on Friday and Saturday. National Implementation began April 10, 2014.


January 2014 Price Change Fact Sheets


Getting Started with Full-Service Intelligent Mail


PostalOne! Contingency Plan

For mailers unable to submit electronic information, click here for the PostalOne! Contingency Plan.











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