Prevent forwarding of spam/phishing emails

jlo77-4107 31 Reputation points


We have a custom domain registered with Microsoft where most of our users are located (e.g
In addition to this, we have a few users on Google (Gsuite) where we registered a subdomain (

To allow our users on Gmail to receive emails, we have registered them on Google and we have also assigned them Microsoft E5 licenses.
Automatic forwarding is enabled to forward all emails for these users to Google.

My question is why the emails are forwarded and delivered to Gmail, in spite of EOP classifying it as quarantine.
It looks like the EOP policies are not applied on forwarded emails. I would like to know I can configure it so that quarantined mails are not forwarded.

The image below shows that the email is classified as quarantined, but then still forwarded to Gmail.


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.
4,358 questions
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.
7,480 questions
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Accepted answer
  1. Jame Xu-MSFT 4,171 Reputation points

    Could you try using the forwarding rules in outlook to see if the same problem occurs? You could create separate rules in the following two places to test.

    2 people found this answer helpful.

1 additional answer

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  1. Amit Singh 4,866 Reputation points

    1) click on the <gesr> (settings) icon
    2) click on <Mail>
    3) click on <Rules>
    4) Set the Rule to apply all messages to be forwarded to the desired address

    1 person found this answer helpful.
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