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Kamal Ibrahim's avatar
Kamal Ibrahim
Copper Contributor
May 30, 2018

Office 365 NDR Messages using Null address

Hi all,

 

I was wondering if you could help me below Scenario.

 

External user sends email to 0365 user, that mailboxes doesn’t exist anymore. NDR will be sent to the external sender.

So that NDR will have the from address in the header as null address <>.

 

I want to set up a transport rule which would be like follows;

 

If the sender from address is <> and inside  organisation and message is addressed to outside organisation change the from address to admin@example.com or postmaster@example.com or any given address.

 

My aim is to stop NDR using null address.

 

Regards,

Kamal

admin
exchange
office 365

4 Replies

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  • VasilMichev's avatar
    VasilMichev
    MVP
    May 30, 2018

    It will not be null, it will be the default value postmaster@domain.com. You can change it by modifying the value specified under ExternalPostmasterAddress:

     

    Set-TransportConfig -ExternalPostmasterAddress blabla@domain.com

     

    Keep in mind that the format used in the NDR message will also depend on the sender's email system and in some cases the address might be replaced.

    • Kamal Ibrahim's avatar
      Kamal Ibrahim
      Copper Contributor
      May 31, 2018

      Thanks Vasil.

       

      Does this apply to OOO messages as well?

       

      Regards

      Kamal

      • VasilMichev's avatar
        VasilMichev
        MVP
        May 31, 2018

        Not sure what you mean by that. OOO messages are generated with the address of the user?

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