You are the Exchange administrator for A. Datum Corporation. The network consists of a single Active Directory domain named adatum.com.

The domain contains two domain controllers. Each domain controller runs Microsoft Windows Server 2003 and is configured as a DNS server.

The network contains a single Exchange organization that contains three servers named Exch1, Exch2, and Exch3. All three servers run Exchange Server 2003.

Your company merges with a company named Trey Research.Trey Research’s network consists of a single Active Directory domain named treyresearch.com.

Trey Research has a single Exchange organization that contains two servers named Mail1 and Mail2.
Both servers run Exchange server 2003. A T1 connection is configured between the two company networks. The relevant portion of the resulting network configuration is shown in the exhibit.

You configure a secondary DNS zone for the treyresearch.com zone on the DNS servers at A. Datum Corporation.

You configure an SMTP connector with an address space of treyresearch.com. The SMTP connector is configured to use DNS for message delivery. You send a test e-mail message to a user at Trey Research.

The message is not delivered and you receive a non-delivery report (NDR).

You need to ensure that you can send e-mail messages from your company to Trey Research across the T1 connection.

What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A.
Configure the SMTP virtual server used by the SMTP connector to use one of the DNS servers at adatum.com as an external DNS server.

B.
Add mail exchanger (MX) resource records for treyresearch.com on the DNS servers at Trey Research.

C.
Configure the SMTP connector to use Mail1.treyresearch.com as a smart host.

D.
Remove the secondary zone for the treyresearch.com DNS domain. Configure a conditional forwarder on your company’s DNS servers to forward all name resolution queries for hosts in treyresearch.com to the DNS servers on the Trey Research network.

E.
Remove the secondary zone for the treyresearch.com DNS domain. Add a stub zone for the treyresearch.com DNS domain on the DNS servers at a. Datum Corporation,

Explanation:
B: In pure Exchange AD organizations, MX record must be manually added to DNS, by addingan MX record when smtp content reach Trey Research network will query for their MX record tosend the mail
D: By configuring a DNS stub zone of treyresearch.com, testking.com DNS will know whichdns is authoritative for reyresearch.com and will forward any query to them

Incorrect answers:
A: If they have not an MX record for their Exchange server this will not work, also this willcause NDR for their own domain
C: Smart host in connectors can handle message delivery on a per-domain basis not for differentdomains s paces
E: By having a secondary zone you can’t add an MX record for Exchange server’s intreyresearch.com domain