Why messages get quarantined because of dangerous headers?
This applies to all the supported versions of F-Secure Internet Gatekeeper. F-Secure Anti-Virus for Internet Mail, the e-mail scanning module in F-Secure Internet Gatekeeper performs multiple structural tests to the e-mails while scanning them for malware. There are several viruses which try to hide themselves in messages which do not follow the SMTP standards. The messages may still be readable with some e-mail clients even though they’re not fully standard ones. F-Secure Internet Gatekeeper detects these malformed messages and does not let the messages pass through. Here is one example of an alert sent by F-Secure Internet Gatekeeper about a potentially dangerous e-mail: 2007-05-09 16:20:00-02:00 fsigk-server SYSTEM F-Secure Anti-Virus for Internet Mail 1.3.6.1.4.1.2213.22.1 Disallowed attachment found in the mail: Sender: <> Recipient: Subject: Ronnie Rocks! Message ID: Spool ID: smtp1234567890 Attachment name: body_part_1.$$$ Attachment size: 23025 bytes Reason: Dangerous header (m
