Managing Postmaster Setting in Exchange Online 365

Posted on Updated on


As Exchange Administrators work to understand all the nuances of Exchange Online, either the older Office 365 (2010) or the newer Office 365 (2013), they have probably asked “What about my Postmaster account, where is it, how do I configure or manage it?  There is no Postmaster account that I can find, so how does this work?”.

In reading through the following, written in 2012, that EXO Admin’s get a default Postmaster account/setting used for your Exchange Online Tenant:

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:

  1. Connect to Exchange Online via Remote PowerShell
  2. Run the following command, which will set your Exchange Online Postmaster setting for your tenant:
Set-TransportConfig -ExternalPostmasterAddress

Whatcha thinkin?

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s