PART V in Software

Draw QR Code in Software PART V

PART V
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Part V:
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Security
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FIGURE 16-16 Con guring SSL for Outlook Anywhere in IIS Manager
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FIGURE 16-17
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16:
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Securing E-mail
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TABLE 16-4 Server-to-Server Data Path Security Types for Exchange 2007
Server to Server
All server-to-server communication in Exchange 2007 is encrypted by default Again, the self-signed certificate implemented at installation is used to secure SMTP traffic between Hub Transport servers using the Internet standard TLS Communication occurs between other roles in Exchange also, especially when they exist on separate server systems and each seems to have its own specific authentication and encryption mechanism Table 16-4 identifies the methods of securing server-to-server communication specific to which server components are participating
Mutual and Opportunistic TLS
When Exchange 2007 connects with another SMTP server over port 25, it checks for the published SMTP command STARTTLS At this point, Exchange will automatically initiate a secure session with that server STARTTLS is an SMTP extension that Exchange uses as well, so mutual TLS is possible with other servers This also increases the security of messaging because communication is secured whenever possible
Summary
Both client access and server-to-server e-mail traffic are secured by default in Exchange 2007 Transport Layer Security (TLS) and Secure Sockets Layer (SSL) using X509 certificates, form the basis for most of the secure communication in the Exchange organization Exchange can make use of its self-signed certificate or use a PKI or trusted Certificate Authority for its certificates In addition, Microsoft provides complementary applications that further expand and protect Exchange services
PART V
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CHAPTER
Anti-Spam
pam has emerged as a major threat to messaging security over the past few years To a large extent, this is facilitated by the fact that e-mail applications and standards, including Simple Mail Transfer Protocol (SMTP), were not written with spam or security in mind In the early days of e-mail, getting messages delivered reliably was more of a concern than spam The earliest reported Internet e-mail that can be called spam is attributed to a message sent by Gary Thuerk at Digital Equipment Corporation (DEC) in 1978 to all ARPANet addresses on the West Coast, to announce a new DEC-20 computer The sharp reaction it drew back then is no different from how most recipients react to spam today (refer to Reaction to the DEC spam of 1978 at http://wwwtempletonscom/brad/spamreact html), except for the fact that most spammers have mastered the art of remaining anonymous and untraceable, and are therefore beyond censure or punishment for most part Nevertheless, it would not be incorrect to say that spam was practically nonexistent back then
What Is Spam
Spam, or junk mail, is also known by its quasi-legal name of Unsolicited Commercial Email (UCE) It is e-mail that you get unsolicited Typically, you do not have any relationship as that of a customer, a vendor, or a subscriber of a mailing list or newsletter with the sender Spam is usually commercial in nature offers for pills that can do wonders for your, ahem health, as well as offers to sell insurance, to make a lot of money working part-time, to get the women of your dreams, or to claim millions of dollars left by some corrupt and now deceased Nigerian government official you would have never otherwise had the opportunity to know or hear from They might even offer software products that will rid your computer of spyware or even eliminate spam! What about e-mail that is not commercial in nature messages from religious or political groups and charities Or ones detailing personal tragedies and asking for donations According to the Controlling the Assault of Non-Solicited Pornography and Marketing Act of 2003, popularly known as the CAN-SPAM Act, such messages are not considered spam Users and administrators of messaging systems may not agree with that legal definition of what constitutes spam, promulgated by US senators Conrad Burns and Ron Wyden, the co-authors of the CAN-SPAM Act
Part V:
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