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Some of my colleagues start to receive messages with text:
"MailScanner was attacked by a Denial Of Service attack, and has therefore deleted this part of the message."
In log file I've got:
"MailScanner: Content Checks: Detected and have disarmed KILLED tags in HTML message"
In "Removing dangerous content" section I've trued to switch of (setting to yes) , one by one, sections like IFrame, From, Script and etc. But nothing happens. I can avoid it only by turning of content scanning. But it leads to security risks.