SURBLs are lists of Uniform Resource Identifier (URI) hosts, typically web site domains, that have been observed in unsolicited messages. SURBLs can be used to search incoming e-mail message bodies for similar sites to help evaluate whether the messages are unsolicited. For example, if http://www.companythatspamsalot.com is blacklisted, then e-mail messages with a message body containing this URL may be classified as unsolicited. A Uniform Resource Identifier (URI), is a compact string of characters used to identify or name a resource. ... Wikipedia does not yet have an article with this exact name. ... “URL†redirects here. ...
SURBL.org claims overall false positive rates between 0.001% to 0.05% [1]. However, one list in particular, ob.surbl.org, uses not spam reports, but content analysis rules, combined with the age of the domain. Critics believe this unjustly punishes legitimate startups and SMEs, many of whom will be unaware of the problem and have their email capabilities restricted with no knowledge of how to solve the problem, or even that it is occurring.[2][3]
See also
DNSBL, a spam prevention method in which e-mail messages are accepted or rejected depending on the IP address of the mail server from which the message is received
A DNS Blacklist, or DNSBL (definition below), is a means by which an Internet site may publish a list of IP addresses that some people may want to avoid and in a format which can be easily queried by computer programs on the Internet. ... An IP address (Internet Protocol address) is a unique address that certain electronic devices use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard (IP)—in simpler terms, a computer address. ... A mail transfer agent or MTA (also called a mail server, or a mail exchange server in the context of the Domain Name System) is a computer program or software agent which transfers electronic mail messages from one computer to another. ...
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