Data quality

Deduplication, returns, CRM hygiene and what bad addresses cost.

Address Correction Fee: What UPS Charges in 2026The UPS address correction fee is $25.25 per package in 2026, up to $175.25 per shipment. What triggers it, what USPS charges instead, and how to avoid it.
National Change of Address (NCOA): How List Updates WorkNational Change of Address data from USPS holds about 160 million moves. How NCOALink processing works, 18 vs 48 months, licence costs and what it misses.
Address Deduplication: Finding Duplicate Customer RecordsAddress deduplication in four steps: normalise, build match keys, compare within postcode blocks, then decide which record survives. With tested code.