Office 365 Office 365 Small Business - using your own domain name

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Forward mail to other mailservers:

PowerShell Cmdlets in Exchange Online

Managing Postmaster Setting in Exchange Online 365

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

When viewing Exchange Online TransportConfig, you will find no entries for the Postmaster account. However if you send a “bad” mail into your Exchange Online tenant, such as, you will receive an NDR from, showing that Exchange Online has the Postmaster setting covered.

If you want to change this setting from to, you will need to use the following Exchange Online Remote PowerShell setting:

Connect to Exchange Online via Remote PowerShell Run the following command, which will set your Exchange Online Postmaster setting for your tenant:

Set-TransportConfig -ExternalPostmasterAddress