The Definition of Spam
The word "Spam" as applied to Email means Unsolicited Bulk Email ("UBE"). Unsolicited means that the Recipient has not granted verifiable permission for the message to be sent. Bulk means that the message is sent as part of a larger collection of messages, all having substantively identical content.
A message is Spam only if it is both Unsolicited and Bulk.
Technical Definition of Spam
An electronic message is "spam" IF:
AND
Important facts relating to this definition:
The sending of Unsolicited Bulk Email ("UBE") is banned by all Internet service providers worldwide.
Spamhaus' anti-spam blocklist, the SBL, used by more than 900 Million Internet users, is based on the internationally-accepted definition of Spam as "Unsolicited Bulk Email".
Therefore anyone sending UBE on the Internet, regardless of whether the content is commercial or not, illegal or not, needs to be fully aware that
Various jurisdictions have implemented legislation to control what they call "spam". One particular example is US S.877 (CAN-SPAM 2004). Each law addresses "spam" in different ways, and as a consequence, often has different definitions of what they cover, whether they call it "spam" or not. Spamhaus uses the industry standard "unsolicited bulk email" definition which underlines "it's not about content, it's about consent". As such, arguments as to whether UBE messages are covered under CAN-SPAM or are compliant with CAN-SPAM, are entirely irrelevant.
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