Effective in version

5.10.0

,

Address Verification

reads CASS certification data files that comply with the SHA-256 standard.

To identify the files that comply with the SHA-256 standard,

Address Verification

updates the naming convention for the CASS certification files. The current CASS certification files are numbered

USA5C101.MD

through

USA5C126.MD

. To verify United States addresses in certified mode, you must use the current files.

Effective in version

5.10.0

,

Address Verification

can recognize ZIP Codes that contain post office box addresses only. When all addresses in a ZIP Code are post office box addresses, the ZIP Code represents a Post Office Box Only Delivery Zone.

Address Verification

adds the value Y to the address to indicate that it identifies a ZIP Code as a Post Office Box Only Delivery Zone.

Use the indicator value to determine when a ZIP Code represents a Post Office Box Only Delivery Zone. For example, online address verification software can use the presence of the value to prompt users for a valid address when a P.O. Box address is not provided.

Address Verification

introduces Post Office Box Only Delivery Zone indicators to support the standards of CASS Cycle O. The United States Postal Service has not implemented Cycle O at the time of the

5.10.0

release.

Address Verification

introduced additional features in version

5.9.0

to prepare for the implementation of CASS Cycle O.

For more information on the Cycle O features in

5.9.0

, see Support for CASS Cycle O requirements.