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Tony Northrup Years ago, I used to recommend that everyone install IIS, enable the SMTP service on the computer that would be running their application, and send messages through the local SMTP server. This process is much more efficient than using a remote SMTP server because the local IIS SMTP server will directly contact each recipient s SMTP servers to send the message. Additionally, you don t have to deal with network connections. However, this approach became unreliable as organizations battled against spam. Organizations now block incoming messages from large blocks of IP addresses. Even if you are not a spammer, messages sent from a local SMTP server might be rejected if your IP address appears on one of these lists. To make it more complicated, you might be able to send messages to most domains but be rejected by others. Ultimately, the job of managing SMTP servers is now too complex to have every user running their own mail server. As a result, I now recommend people use their ISP s or their organization s mail server for outgoing messages.

For details about all the practice test options available, see the How to Use the Practice Tests section in this book s introduction.

3. A commercial customer wants to configure offline files on a network server, so he can synchronize a laptop computer in a sync partnership, download the files to the laptop, and work on them at home. He has recently purchased a laptop computer running Windows Vista Business for that purpose. A work colleague has told him he needs Windows Vista Ultimate to synchronize with offline files. What do you tell him

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Many things can go wrong when sending e-mail. For example, the mail server might not be available, the server might reject your user credentials, or the server might determine that one of your recipients is invalid. In each of these circumstances, the runtime will throw an exception, and your application must be prepared to catch the exception.

15

To help you successfully master the exam objectives presented in this chapter, complete the following tasks.

15

Public key infrastructures (PKIs) are becoming core infrastructure elements for all modern organizations. Almost every organization today has some use for public key certificates. Whether it is to secure wireless communications, to offer secure commercial services on Web sites, to integrate Secure Sockets Layer (SSL) virtual private networks, or even just to sign e-mail and identify themselves in Web environments, organizations everywhere are using PKI certificates. With PKI certificates comes the infrastructure itself an infrastructure you must first create and then manage. Microsoft has included the ability to generate and maintain PKIs directly in the OS for some years now. In the case of Windows Server 2008, this ability is provided by Active Directory Certificate Services (AD CS), known simply as Certificate Services in previous versions of Microsoft Windows. Because of this, organizations are now choosing to implement and manage their own infrastructures.

When you send a message, you should always be prepared to catch an SmtpException. Messages are frequently rejected because the SMTP server cannot be found, the server identified the message as spam, or the server requires a username and password. You should also catch SmtpFailedRecipientException, which the runtime will throw if the SMTP server rejects a recipient e-mail address. SMTP servers reject only local recipients. In other words, if you are sending a message to tony@contoso.com and are using Contoso s SMTP server, the server is likely to reject the message if tony@contoso.com is not a valid address (causing the runtime to throw a SmtpFailedRecipientException). However, if you are sending a message to the same invalid address using Fabrikam s SMTP server, the SMTP server will not be able to identify that the e-mail address is invalid. Therefore, the runtime will not throw an exception. Table 15-1 summarizes these and other exceptions that the runtime might throw.

Practice 1: Connect to an External Monitor The practice session asks you to connect an external monitor manually and extend your mobile PC screen on to it. Experiment with both a modern flat-screen monitor and an older monitor, possibly a cathode-ray tube (CRT) monitor, and find out whether the monitors require different procedures or different presentation settings. Practice 2: Connect to a Plasma Screen Monitor If you have access to a plasma screen monitor, extend your mobile PC screen to this monitor. Practice 3: Connect to a Network Projector If you have access to a network projector, connect your mobile PC to it, and configure presentation settings. Connect from both the same subnet as the network projector and from another subnet.

For more information on the various aspects of a PKI, look up the PKI white paper series at http:// www.reso-net.com/articles.asp m=8 under the Advanced Public Key Infrastructures section.

Table 15-1

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