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

• Compare Office 365 for business plans
• Set up and manage domains
• Create and use shared mailboxes
• Add an email alias to a user account

• User Account Management

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. postmaster@domain.com is set to postmaster@domain.onmicrosoft.com

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 cat@dog.com, you will receive an NDR from postmaster@domain.onmicrosoft.com, showing that Exchange Online has the Postmaster setting covered.

If you want to change this setting from postmaster@domain.onmicrosoft.com to postmaster@domain.com, you will need to use the following Exchange Online Remote PowerShell setting:

Connect to Exchange Online via Remote PowerShell http://help.outlook.com/en-us/140/cc952755.aspx Run the following command, which will set your Exchange Online Postmaster setting for your tenant:

Set-TransportConfig -ExternalPostmasterAddress postmaster@domain.com

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