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FairUCEFair use of Unsolicited Commercial EMail (IBM)
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Technically, FairUCE tries to find a relationship between the envelope sender's domain and the IP address of the client delivering the mail, using a series of cached DNS took-ups.
If a relationship can be found, FairUCE checks the recipients whitelist and blacklist, as well as the domain's reputation, to determine whether to accept, reject, challenge on reputation, or present the user with a set of whitelist/blacklist options.
The FairUCE concept is currently implemented as an SMTP proxy that runs between multiple instances of Postfix on Linux.