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MHTML files are not being caught by Disarm in Messaging Gateway

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Article ID: 163538

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Updated On:

Products

Messaging Gateway

Issue/Introduction

Even with the Disarm feature in Symantec Messaging Gateway (SMG) enabled and MHTML files passing through the SMG without being disarmed.

Cause

Currently the Disarm feature is not designed to scan MHTML files.

Resolution

In its current implementation, the Disarm feature does not scan MHTML files. 

Workaround

To block MHTML files, create an Attachment List for MHTML files and then associate that Attachment List with a Content Rule

To create an Attachment List for MHTML files

  1. In the SMG Control Center, navigate to Content -> Attachment Lists
  2. Click Add.
  3. Name the new list "MHTML FILES"
  4. Select Word Processor Document on the left panel and then MHT format on the right panel.
  5. Click Add.
  6. Click Save.

To Create a content rule to block MHTML files

  1. In the SMG Control Center navigate to Content 
  2. Click Add.
  3. Click Select to select a new blank policy.
  4. Name the new policy "MHTML - Hold in Spam Quarantine"
  5. Under Conditions click Add.
  6. Select "Attachment or Body part:" and "Is in the attachment list:"
  7. Select the attachment list "MHTML FILES"
  8. Click Add Condition.
  9. Under Actions click Add.
  10. Select "Hold message in Spam Quarantine". Click Add Action.
  11. Select a group or groups on which to apply the rule.
  12. Click Save.