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"Wanna" ransomware outbreak. Please see this Sophos article sophos.com/kb/126733 for advice on how to protect your organization. Immediate action recommended.
Issue PureMessage and Exchange 2003 SCL (spam confidence level). How PureMessage for Microsoft Exchange correlates our own spam score with IMF SCL. Sophos product and version PureMessage for Microsoft Exchange, version 3.0.1 Operating system Windows Server 2003+
Technical Information:PureMessage in AVAS mode is compatible with Intelligent Message Filtering (IMF) - it will increase the value of the Spam Confidence Level (SCL) applied by the IMF, if it is below the PureMessage rating based on the following:if ( lSpamScore < 10 ) return 0;if ( lSpamScore < 20 ) return 1;if ( lSpamScore < 30 ) return 2;if ( lSpamScore < 40 ) return 3;if ( lSpamScore < 50 ) return 4;if ( lSpamScore < 60 ) return 5;if ( lSpamScore < 70 ) return 6;if ( lSpamScore < 80 ) return 7;if ( lSpamScore < 90 ) return 8;return 9;
Additional informationMore information can be found on the Microsoft website:
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