Scrubby

Scrubby specialises in the addresses other verifiers cannot answer: catch-all and risky emails. Many B2B domains accept mail for any address, so standard SMTP checks come back unknown, and cold email teams are left to either throw those leads away or risk bouncing.

Scrubby goes beyond SMTP checks by testing those addresses directly and drawing on data from its network, then sorting them into valid, risky-valid and invalid. The company says this recovers up to 42% more usable leads from an existing list while keeping bounce rates under 2%. The trade-off is time: because it tests addresses rather than just querying servers, results typically take 24 to 72 hours, so it works best as a step in list preparation rather than for same-day campaigns.

Scrubby is best used alongside a standard verifier. Run your list through a regular tool first, then send only the catch-all and unknown segment to Scrubby.

New accounts start free with 200 credits. Paid plans are billed monthly and start at about $27 for 1,000 validation credits, with larger tiers and enterprise pricing lowering the cost per credit.