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How to block attachments by file types (not extensions)?

Hi, We're using ESA C170 with SyncOS 7.5.2-014. I added a content filter with "file type is": executables and expect that if an executable attachment comes in it will blocked. But it isn't when the extension is changed to .txt, for example. Just also tested: Even with .exe extension it passed the ESA and was detected with Exchange or Outlook. Can someone tell me how to block then all executable attachments? Thanks
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‎04-23-2014 07:20 AM
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