When setting up MS Journaling for email archiving use the following steps.
For the External Email Address field, click Edit, enter the archive email address. (xxxxxx.EXAMPLE@example.<domain>.com), then click OK.
Click Next, then click New.
Click OK.
Use the Set-Mailbox cmdlet to modify the settings for the journaling mailbox so that it is removed from the Global Address List. Issue the following command:
Set-Mailbox AMaster -HiddenFromAddressListsEnabled $true
Use the Set-Mailbox cmdlet to modify the settings for the journaling mailbox to prevent anyone from sending email messages directly to the that mailbox. Issue the following command:
Set-Mailbox AMaster -AcceptMessagesOnlyFrom AMaster