Turning on "Require validation success" in Clay’s Validation settings means that only emails which pass the validation step are considered valid and will be included in your results. If an email fails validation, Clay will continue searching for another email using the next provider in your waterfall, rather than accepting the invalid or unverified email. [1] This ensures that your final list contains only emails that are confirmed as deliverable, improving data quality and reducing bounce rates. [2] If you also enable "Only mark 'Safe to Send' emails as valid," catch-all or uncertain emails are excluded, making the process even more conservative. [3]
