MS Office 365

Office 365 – Block Email Auto-Forwarding to External Domain

Create a Mail Flow

Transport rules are one of the granular methods to disable external auto-forwarding of emails in the organization, as admins can specify required conditions and actions. 

  • Open Exchange Admin Center. 
  • Select the Rules under Mail Flow
  • Click on the + icon to create a new rule. 
Mail Flow of Blocking Auto-forward to External Domains