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Q & A Security · August 21, 2026

Do I need to check all blacklists or just the major ones?

Focus on the high-impact lists: Spamhaus ZEN, SBL, DBL, Barracuda BRBL, and Microsoft SmartScreen. These cover Gmail, Outlook, Yahoo, and most enterprise mail gateways. A listing on an obscure list with few adopters has minimal real-world impact. DomainScan flags impact level (Critical / High / Medium / Low) so you know where to prioritize.

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How to Check If a Domain Is Blacklisted (Step-by-Step)
A domain blacklist listing can silently kill email delivery and trigger browser warnings. This guide walks through how to check any domain against 50+ blocklists, read the results, and take action.
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Can a domain be blacklisted even if I never sent spam? How long does delisting take? What's the difference between an IP blacklist and a domain blacklist?