question on policy

Sree 1,971 Reputation points
2021-09-18T12:37:59.803+00:00

how the phishing policy handles internal domains? Could someone explain in detail

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
7,438 questions
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Accepted answer
  1. Joyce Shen - MSFT 16,646 Reputation points
    2021-09-20T06:27:16.707+00:00

    Hi @JustinMicheal-7973

    We could refer to the introduction of anti-phishing policy in the official document.

    By default, no sender domains are configured for impersonation protection in Enable domains to protect. Therefore, by default, no sender domains are covered by impersonation protection, either in the default policy or in custom policies.

    When you add domains(domains you own or partner domains) to the Enable domains to protect list, messages from senders in those domains are subject to impersonation protection checks. The message is checked for impersonation if the message is sent to a recipient that the policy applies to (all recipients for the default policy; Users, groups, and domains recipients in custom policies). If impersonation is detected in the sender's domain, the impersonation protection actions for domains are applied to the message (what to do with the message, whether to show impersonated users safety tips, etc.).

    And if you want to know more about how EOP backend handles internal domain, I would suggest you open a service request to get more information.


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