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Securing Your System, Messages, and Identity
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Con guring HTML Message Handling . . . . . . . . . . . . . 329 Protecting Messages with Digital Signatures . . . . . . . . 333 Signing Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
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Encrypting Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 356 Protecting Data with Information Rights Management . . . . . . . . . . . . . . . . . . 361
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icrosoft Of ce Outlook 2007 includes features that can help protect your system from computer viruses and malicious programs, prevent others from using e-mail to impersonate you, and prevent the interception of sensitive messages. Some of these features such as the ability to block speci c types of attachments were rst introduced in Of ce Outlook 2002. Other security features such as the ability to block external images in HTML-based messages were introduced in Of ce Outlook 2003. This feature enables Outlook to block HTML messages sent by spammers to identify valid recipient addresses. These messaging security features are extended and enhanced in Of ce Outlook 2007.
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This chapter begins with a look at the settings you can use to control HTML content. Because HTML messages can contain malicious scripts or even HTML code that can easily affect your system, the capability to handle these messages in Outlook 2007 is extremely important. This chapter also discusses the use of both digital signatures and encryption. You can use a digital signature to authenticate your messages, proving to the recipient that a message indeed came from you, not from someone trying to impersonate you. Outlook 2007 enables you to encrypt outgoing messages to prevent them from being intercepted by unintended recipients; you can also read encrypted messages sent to you by others. In this chapter, you ll learn how to obtain and install certi cates to send encrypted messages and how to share keys with others so that you can exchange encrypted messages.
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Spammers are always looking for new methods to identify valid e-mail addresses. Knowing that a given address actually reaches someone is one step in helping spammers maintain their lists. If a particular address doesn t generate a response in some way, it s more likely to be removed from the list.
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Securing Your System, Messages, and Identity
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One way spammers identify valid addresses is through the use of Web beacons. Spammers often send HTML messages that contain links to external content, such as pictures or sound clips. When you display the message, your mail program retrieves the remote data to display it, and the remote server then validates your address. These external elements are the Web beacons.
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Note
Nonspammers also frequently include external content in messages to reduce the size of the message. So external content isn t a bad thing per se (depending on how it is used).
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Since Outlook 2003, Outlook blocks external content from HTML messages by default, displaying a red X in the place of the missing content. The result is that these Web beacons no longer work because the external content is not accessed when the message is displayed. Messages that t criteria for the Safe Recipients and Safe Senders lists are treated as exceptions the external content for these messages is not blocked.
Note
You can rest the mouse pointer on a blocked image to view the descriptive alternate text (if any) for the image.
When you preview an image in the Reading Pane for which Outlook 2007 has blocked external content, Outlook 2007 displays a message in the InfoBar, indicating that the blocking occurred (see Figure 14-1). You can click the InfoBar and choose Download Pictures to view the external content. Outlook 2007 then downloads and displays the content in the Reading Pane. The same is true if you open a message; Outlook 2007 displays a warning message, telling you that the content was blocked (see Figure 14-2). You can click the warning message and choose Download Pictures to download and view the content. Outlook 2007 s blocking of external content for messages in this way lets you take advantage of content blocking without using the Reading Pane. If you edit, forward, or reply to a message containing blocked content (from an open message or a message displayed in the Reading Pane), Outlook 2007 displays a warning dialog box indicating that the external content will be downloaded if you continue. You can click OK to download the content and continue with the reply or forward, click No to tell Outlook 2007 to forward the content as text without downloading the content, or click Cancel to not open the message or download the content (see Figure 14-3). Thus, you can now reply to or forward a message without downloading the external content (which wasn t possible with previous versions of Outlook).
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