How to reject emails addressed "To" or "From" a particular email address in sendmail?

Solution Unverified - Updated -

Issue

  • How to prevent sendmail from sending emails to user@example.com?
  • How to prevent sendmail from sending emails from user@example.com?

Environment

  • Red Hat Enterprise Linux 6
  • sendmail-8.13.8-8.1.el5_7

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