Step 2: Configure Exchange
Now you need to configure your Exchange server to let Bob and other users relay
SMTP mail through Exchange as their aasolutions.com account. To do so, open
ESM on your Exchange server. In this example, Thomas and Associates has a single,
dual-homed Exchange server connected to the Internet and internal LAN. If your
environment is different, you'll need to adjust the configuration steps according
to how many network connections and virtual SMTP servers you have—but
the overall process is the same.
Navigate to the Protocols\SMTP folder for your Exchange server. In our example,
the Default SMTP Virtual Server has an IP address on the internal LAN and services
internal clients. The Internet SMTP Virtual Server has an IP address on the
Internet and currently receives email from other SMTP servers. SMTP relaying
is enabled on the internal SMTP server but disabled on the Internet virtual
server to prevent spammers from using the server as a relay point. This means
that if Bob's laptop is connected to the internal LAN, he can send mail by using
his new aasolutions.com account without any problem, but if he tries to connect
when away from the office, the Internet virtual SMTP server will reject his
attempt to relay email.
To enable SMTP relaying on the Internet virtual SMTP server, open the Internet
SMTP Virtual Server's properties, click the Access tab, then click Relay. In
the Relay Restrictions dialog box, select the Allow all computers which successfully
authenticate to relay, regardless of the list above check box. Now when
Bob is away from the office and sends a message by using his alias POP account,
Outlook will authenticate to the Exchange server and relay the message successfully.
If you have any email-security products installed on your Exchange server, make
sure they're configured, if necessary, to allow relays by authenticated users.
If you want additional protection for Bob's password and encryption of the
message when it's sent between Bob's PC and the Exchange server, consider implementing
Secure Sockets Layer (SSL) encryption and a server certificate for the Exchange
server. Remember, though, that Bob will typically use the aasolutions.com identity
to send outgoing email to external parties, which means the mail won't be encrypted
when Exchange forwards it on the recipient's SMTP server anyway.
Wrapping Up
You're done! When Bob receives a message and clicks Reply, Outlook automatically
selects the appropriate account to use when sending the message. Bob has to
maintain only one mailbox with one inbox, and all his sent messages are stored
in his Sent folder regardless of which identity he uses. When Bob creates a
new message without replying, he needs to make sure he clicks the Accounts button
on the new message window's toolbar to ensure that he uses the correct "from"
address. Once you start using multiple email identities, you'll likely find
that this capability gives your company more flexibility in communicating with
customers.