| http://www.w3.org/ns/prov#value | - The quality of spam filtration is also enhanced by an extended and improved mechanism for analyzing message headers; and by implementing new filtering technologies, including the Sender Policy Framework (SPF) and Spam URL Realtime Blocklists (SURBL), which are used to customize the spam filtration policy and are based on spam sender address lists that are updated in real-time.The new web-based use
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