You are the messaging engineer for your company. All user mailboxes are hosted on Exchange Server 2003 servers. You do not plan to move any mailboxes to the Exchange Server 2007 Mailbox servers or to upgrade your Active Directory schema. You need to recommend a solution that uses Exchange Server 2007 to reduce the amount of spam that enters the Exchange organization. Which two of the following solutions should you recommend? (Each correct answer presents a complete solution. Choose two.)
A.
Install the Edge Transport server role on the new server. Configure the new server to forward all inbound
e-mail messages to the Exchange Server 2003 servers.
B.
Subscribe to Exchange Hosted Filtering (EHF). Forward all mail received by EHF to the Exchange Server
2003 servers.
C.
Install a Hub Transport server. Install anti-spam agents on the Hub Transport server.
D.
Install a Hub Transport server. Create a new Send connector and a new Receive connector on the Hub
Transport server.
E.
Configure a smart host on the Exchange Server 2003 SMTP virtual server. Enable Sender ID filtering for
the Exchange organization.
Explanation:
In the perimeter network of a Exchange 2003 organization, you can deploy a 2007 Edge server to act as a smart host and SMTP relay, as well as to provide anti-spam, anti-virus, and transport rules processing.Without 2007 server roles implemented inside the organization, you cant configure any features on this server that rely on the Edge Subscription process. These include recipient lookup, safelist aggregation, and domain security.
First, deploy the Edge server in the perimeter network. Then, configure connectors between this machine and both the 2003 organization and the Internet. For end-to-end mail flow, you need:
1. A Send Connector from the Edge server to the Internet
2. A Send Connector from the Edge server to the 2003 organization.
3. A Receive Connector on the Edge server to accept only links from the 2003 organization
4. An SMTP Send Connector from the 2003 organization out to the Edge server.
The default Receive Connector on the Edge server is already configured to allow anonymous connections from the Internet and, thus, requires no change.
Determine what authentication method to used to secure the connection between the Edge server and the Bridgehead server of the 2003 organization. This can be either Basic or Anonymous access. If you choose the latter, you must, additionally, modify the 2003 server registry to allow anonymous receipt of XExch50 information. This contains essential data, such as the spam confidence level for a message.
Configure an Accepted Domain on the Edge server for each SMTP namespace for which the organization receives mail. Make any necessary changes to the MX resource records in DNS to have mail from these domains directed to the Edge server. Finally, configure the Edge server to perform anti-virus and anti-spam processing and apply whatever transport rules are needed.
http://technet.microsoft.com/en-us/library/bb124011.aspx
Exchange Hosted Filtering utilizes a multilayered defense to block malware from reaching your corporate gateway. EHF includes multiple filters, deployed over the Internet, to protect business email from spam, viruses, phishing scams, and mail policy violations.
By just updating an MX record, EHF can be up and running. There is no hardware to buy, no software to install, no staff training to endure — in fact, no reason to modify the current mail infrastructure in any way.
The heart of EHF is a network of data centers distributed at key sites across the Internet backbone. Each center contains fault-tolerant servers, load-balanced from site to site and from server to server. In the unlikely event one such center goes down, mail traffic can be easily routed to another, greatly diminishing the chance for any service interruption.
http://www.microsoft.com/exchange/services/filtering.mspx