The Spam Uniform Resource Identifier Real-time Block List (SURBL) is a collection of public lists that identify Uniform Resource Identifier (URI) hosts, typically websites, that have appeared in unsolicited email messages. SURBL lists search incoming email message bodies for spam links to help evaluate whether the messages are unsolicited.
For example, if http://www.example.com is listed in the SURBL, then email messages with a message body containing this URI may be classified as unsolicited. URI Domain Name System Blocklists (DNSBLs) differ from other DNSBLs, which commonly list mail-sending IP addresses. SURBL listings are factored into many anti-spam reputation systems.
- Listings occur at the URI level. SURBL very rarely lists IP addresses as they are typically not used as a website address.
- Impact on deliverability is high.
Reasons for getting listed
SURBL lists website URIs found in the body of a message associated with spam activity. The URIs go to malicious sites or the URIs have received spam complaints that have turned the reputation negative.
How to get off this blocklist
To request removal, go to the SURBL Lookup page and follow the instructions on the removal form.