Follow the below steps to forward the incoming mail of person A( to person B (

  1. From the Admin console Home page, go to Appsand thenG Suiteand thenGmailand thenAdvanced settings.

    Tip: To see Advanced settings, scroll to the bottom of the Gmail page.

  2. Click Default routing.
  3. Click Add setting.
  4. From the list, select the envelope recipients to match:
  5. Save the settings.