SURBL offers powerful reputation intelligence on domains used in spam, phishing, malware, and other malicious content. Instead of listing senders, SURBL tracks URLs and hosts embedded in email bodies, SMS messages, web links, and more.
Their data feeds include:
- Multi: domain list of known abused or malicious websites, usable for spam filtering, tagging, or blocking.
- Fresh: recently delegated/registered domains (young domains are often risky).
- HashBL: hashed listings of abused resources (shortened links, crypto addresses, abused sender or reply-to addresses, etc.).
SURBL supports multiple formats: API, DNS, CSV, RPZ, rsync, etc., so integration into email filters, firewalls, SMS platforms, and web safe-browsing tools is flexible.
Using SURBL helps reduce spam, block phishing, mitigate domain abuse risk, and improve deliverability—because emails with links to known bad-domains are flagged or rejected. Organisations gain stronger protection when combining SURBL with other intelligence sources.
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