Applies to: Exchange Server 2013
Topic Last Modified: 2013-01-30
The external postmaster address is used as the sender for system-generated messages and notifications sent to message senders that exist outside of your Microsoft Exchange Server 2013 organization. An external sender is any sender that has an email address in a domain that isn't configured as an accepted domain in your organization.
By default, the value of the external postmaster address setting is blank. This default value causes the following behavior in your Exchange organization:
- The external postmaster address is postmaster@<Default
accepted domain> for all Mailbox servers and subscribed Edge
- The external postmaster address is postmaster@<Edge
Transport server FQDN> for all unsubscribed Edge Transport
What do you need to know before you begin?
- Estimated time to complete: 15 minutes
- You need to be assigned permissions before you can perform this
procedure or procedures. To see what permissions you need, see the
"Transport configuration" entry in the Mail Flow
- When you configure a custom external postmaster address, that
value applies to all Exchange 2013 Mailbox servers and Exchange
2010 Hub Transport servers in your Exchange organization. However,
that value isn't replicated to Edge Transport servers. If you
specify a custom value for the external postmaster address, you
need to manually configure the external postmaster address value on
any Edge Transport servers.
- If you have any Exchange 2007 Hub Transport servers or Edge
Transport servers in your organization, you need to configure the
custom external postmaster address on each one of those servers
using the Set-TransportServer cmdlet. For more information,
see Managing the External Postmaster Address.
- For information about keyboard shortcuts that may apply to the
procedures in this topic, see Keyboard Shortcuts in
the Exchange Admin Center.
What do you want to do?
Use the EAC to configure the external postmaster address
- In the EAC, navigate to Mail flow > Receive
connectors > More options > Organization transport settings
> Delivery tab.
- In the External postmaster address field, enter the SMTP
email address, for example,
firstname.lastname@example.org. If you want to return the external postmaster address to the default value, delete any existing value so the field is blank.
- When you're finished, click Save.
Use the Shell to configure the external postmaster address
To configure the external postmaster address, use the following syntax.
Set-TransportConfig -ExternalPostmasterAddress <postmaster address>
For example, to set the external postmaster address to
email@example.com, run the following
Set-TransportConfig -ExternalPostmasterAddress firstname.lastname@example.org
To return the external postmaster address to the default value, run the following command:
Set-TransportConfig -ExternalPostmasterAddress $null
How do you know this worked?
To verify that you have successfully configured the external postmaster address, do the following:
- Run the following command on a Mailbox server to verify the
external postmaster address value:
Get-TransportConfig | Format-List ExternalPostmasterAddress
- From an external email account, send a message to your Exchange
organization that will generate a delivery status notification
(DSN). For example, you can configure a transport rule to send a
non-delivery report (NDR) for a message from that sender that
contains specific keywords. Verify the sender's email address in
the DSN matches the value you specified.