How to set the postmaster address in Office 365

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By default when Exchange Online in Office 365 is setup for your organization, the postmaster address, e.g. postmaster@domain.com is set to postmaster@domain.onmicrosoft.com.

This means that when someone sends mail to your organization and gets an NDR back, the sender is: postmaster@domain.onmicrosoft.com.

If you want to change this, you can do so using PowerShell for Exchange Online.

The procedure for changing this is:

1. Connect to your Exchange online using PowerShell

2. Change addres using command:

Set-TransportConfig –ExternalPostmasterAddress postmaster@domain.com

 

This works for All P and E plans – I have not tested it yet for K plan.

This postmaster address is a tenant/organization level setting which applies to all domains in your tenant. It is not available to set the postmaster address on a domain level.

3 thoughts on “How to set the postmaster address in Office 365”

  1. How can I log in and see and read emails being sent to any of these?

    security@
    hostmaster@
    postmaster@
    webmaster@

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