How to choose a reliable hygiene provider?

Evaluation criteria include: accuracy (test against your own known-good addresses), coverage (major and regional MBPs), speed (processing time for your volumes), pricing (cost per validation at your scale), and integration (**ESP** connections, **API** quality).

Red flags: guaranteed 100% accuracy (impossible), extremely low pricing (may indicate corners cut), lack of transparency about methods, and no trial or testing option.

Evaluation process: request trials from multiple providers, validate a test set of known addresses, compare results and pricing, check reviews and case studies, and assess support quality. Most reputable providers offer similar core capabilities; differences emerge in details and service quality.