Mailing Resources
POSTAL EXPLORER
A virtual library of postal information and tools designed for U.S. Postal Service customers, business mailers, and employees.
POSTAL ALERTS
Provide information to customers when there are occurrences that may affect your mailings and deliveries. This includes storms, equipment and system issues.
BUSINESS CUSTOMER GATEWAY
The BCG is used to retrieve information about your mailing as well as submit your mailings electronically. ACS returns can also be viewed on the BCG.
CASS LOOKUP
CASS, or “Coding Accuracy Support System” standardizes addresses so that they conform with USPS guidelines for street address abbreviations, city name abbreviations, and zip codes. It also assigns zip+4 extended zip codes, carrier route information, and Line-Of-Travel information. All address records in an Interlink Circulation list are CASS processed as part of the list servicing that happens during the postal sort.
To check individual addresses instantly, try our online CASS Lookup, updated monthly with the latest address information directly from the USPS.
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