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[ScreenOS] Anti-Spam: SPAM FOUND! ( Deny reason: Invalid parameter



Article ID: KB21351 KB Last Updated: 27 Jul 2011Version: 1.0
Meaning of event log - Anti-Spam: SPAM FOUND! ( Deny reason: Invalid parameter.
The following event log appears occasionally with zero IP address and invalid parameter:
2011-04-23 02:16:54 system warn 00563 Anti-Spam: SPAM FOUND ! ( Deny reason: Invalid parameter.
The log is generated due to the mail header "Received: (qmail 1450 invoked from network); 19 Apr 2011 09:17:55 -0000", because there is no valid IP address or hostname in the mail header as shown in the PCAP below:
Frame 20 (1136 bytes on wire, 1136 bytes captured)
Ethernet II, Src: Yamaha_16:dc:f7 (00:a0:de:16:dc:f7), Dst: JuniperN_ba:e3:86 (80:71:1f:ba:e3:86)
Internet Protocol, Src: (, Dst: (
Transmission Control Protocol, Src Port: 65326 (65326), Dst Port: smtp (25), Seq: 3386631973, Ack: 1792799608, Len: 1082
Simple Mail Transfer Protocol
C: .
[DATA fragments (2101 bytes): #18(1024), #20(1077)]
Internet Message Format
Received: (qmail 1450 invoked from network); 19 Apr 2011 09:17:55 -0000
Received: from unknown (HELO .) (\r\n by with SMTP; 19 Apr 2011 18:17:55 +0900
Received [truncated]: from [] (account HELO\r\n\tby . (CommuniGate Pro SMTP 5.2.3)\r\n\twith ESMTPA id 809143514 for <>,\r\n\t
Date: Tue, 19 Apr 2011 14:47:54 +0530
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