{"id":5510,"date":"2026-05-20T13:51:38","date_gmt":"2026-05-20T13:51:38","guid":{"rendered":"https:\/\/emailwarmup.com\/blog\/?p=5510"},"modified":"2026-05-20T14:03:55","modified_gmt":"2026-05-20T14:03:55","slug":"b2b-data-providers-deliverability-testing","status":"publish","type":"post","link":"https:\/\/emailwarmup.com\/blog\/email-statistics\/b2b-data-providers-deliverability-testing\/","title":{"rendered":"We Tested 10 B2B Data Providers for Deliverability (5000 Contacts x 4 Metrics)"},"content":{"rendered":"\n
\"Testing<\/figure>\n\n\n\n

Your B2B data provider determines whether your outbound emails reach inboxes or get swallowed by spam filters \u2014 if your emails are not getting seen, your cold outbound campaign gets fractured<\/strong>.<\/p>\n\n\n\n

Out of curiosity (and requests from some of our clients), we ran a controlled deliverability audit across the ten most widely used data platforms in 2026 to measure what actually happens after<\/em> the data leaves the provider and enters a real sending environment.<\/p>\n\n\n\n

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  1. Clay<\/li>\n\n\n\n
  2. Lusha<\/li>\n\n\n\n
  3. Apollo.io<\/li>\n\n\n\n
  4. ZoomInfo<\/li>\n\n\n\n
  5. People Data Labs<\/li>\n\n\n\n
  6. Clearbit (Breeze Intelligence)<\/li>\n\n\n\n
  7. RocketReach<\/li>\n\n\n\n
  8. Cognism<\/li>\n\n\n\n
  9. 6sense<\/li>\n\n\n\n
  10. Kaspr<\/li>\n<\/ol>\n\n\n\n

    The results split<\/em> the market into three clear tiers: <\/p>\n\n\n\n

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    1. Providers where it’s a secondary concern<\/li>\n\n\n\n
    2. Providers where email deliverability<\/a> is structurally protected<\/li>\n\n\n\n
    3. Providers where it actively degrades sender infrastructure<\/li>\n<\/ol>\n\n\n\n

      The gap between the best and worst was wider than expected. Just to sum up what we actually found out in a quick overview:<\/p>\n\n\n\n

      \n