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After CASS certifying your addresses, you'll want to print Form 3553 for your internal records.

In addition, the Post Office may require this CASS™ certification form when submitting automation (barcoded) or carrier route mailings. Form 3553 shows how many address matches were attempted, how many were matched, when the matching was done, and the date of the file that was used.

 To print Form 3553
  1. After you download your file from the CASS server, click USPS Form 3553.
  2. Click Print.