Will CU override mail flow rules?

Noctis0791 121 Reputation points
2021-03-29T21:50:57.193+00:00

Hi Everyone,

We have some Mail Flow Rules configured on our Local Exchange 2016 Server. Will CU 20 override these customizations? Please advise.

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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.
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  1. Andy David - MVP 110.4K Reputation points Microsoft MVP
    2021-03-29T22:04:25.617+00:00

    No, absolutely not. Upgrading will not affect any transport rule.
    Those are stored in AD, not in the server config.


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  1. Joyce Shen - MSFT 16,331 Reputation points Microsoft Employee
    2021-03-30T06:06:45.093+00:00

    Hi @Noctis0791

    Agree with the reply above from Andy, mailflow rules will not be override after updating CU.

    And if you have customised the files list above, it's better to backup and reconfigure them after the update.

    Below threads discussed the similar issue for your reference:

    IIS, Default website, Exchange and our company website
    Exchange Server 2016 CU11 install
    Installing exchange CU precautions and effects on custom configuration


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