Explanation/Reference:
Explanation:
You can configure a relay domain as an internal relay domain or as an external relay domain. These two relay domain types are described in the following sections.
When you configure an internal relay domain, some or all of the recipients in this domain don't have mailboxes in this Exchange organization. Mail from the Internet is relayed for this domain through Transport servers in this Exchange organization. This configuration is used in the scenarios that are described in this section.
To support these scenarios, you need to create an accepted domain that's configured as an internal relay domain. You also need to add a Send connector that's sourced on a Mailbox server and configured to send email to the shared address space. If an accepted domain is configured as authoritative and a recipient isn't found in Active Directory, a non-delivery report (NDR) is returned to the sender. The accepted domain that's configured as an internal relay domain first tries to deliver to a recipient in the Exchange organization. If the recipient isn't found, the message is routed to the Send connector that has the closest address space match.
B: An accepted domain is any SMTP namespace for which a Microsoft Exchange Server 2013 organization sends or receives email.
Accepted domains include those domains for which the Exchange organization is authoritative. An Exchange organization is authoritative when it handles mail delivery for recipients in the accepted domain.
Accepted domains also include domains for which the Exchange organization receives mail and then relays it to an email server that's outside the organization for delivery to the recipient.
D: 2nd part of establishing an internal relay domain is to establish a Send Connector that is configured to point to the other organization's mail servers (a datum)