External Email Warning – Gsuite


Setting up an external email warning.


Google makes this process a lot more complicated than Office 365

  1. Go into Gsuite console
  2. Go to Apps > G Suite > Settings for Gmail > Content Compliance
  3. Email messages to affect
    1. Inbound
  4. Add expressions that describe the content
    1. if ANY of the following match the message
    2. Click Add > Advanced content match
      1. Location: Subject
      2. Not Contains Text: [EXT]
    3. Click Add > Advanced content match
      1. Location: Full headers
      2. Contains text:
        1. First field: Ext
        2. Second field: External
  5. If the above expressions match, do the following
    1. Modify message
    2. Select: Add custom headers
    3. Click Add
      1. First field: EXT
      2. Second field: External
    4. Prepend custom subject
      1. [EXT]
  6. Scroll to the bottom and click on show options
  7. Under Account types to affect, make sure Users and Groups are selected
  8. Save