Hot to create a rule that blocks messages with executable attachments?

  1. Login to control panel of Microsoft Office 365 using following URL:
  2. Go to Admin Panel.
  3. In the Admin Center go to Exchange >> Mail Flow >> Rules.
  4. Click Add (+)and then select ‘Create a new rule’.

5.  In the New rule page that opens, configure the following settings:

  • Name: Enter a unique, descriptive name for the rule.
  • Click More Options.
  • Apply this rule if: Select Any attachment
  • >> has executable content.
  • Do the following: Select Block the message and then choose the action you want:
    • reject the message and include an explanation: In the Specify reject reason dialog that appears, enter the text you want to appear in the non-delivery report (also known as an NDR or bounce message)
    • reject the message with the enhanced status code of: In the Enter enhanced status code dialog that appears, enter the enhanced status code that you want to appear in the NDR. The default rejection text is: Delivery not authorized, message refused.
    • reject the message without notifying anyone

6. When you’re finished, click Save. Your attachment blocking rule is now in force.

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