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Sender Like the Recipient lter, this lter uses a locally maintained blocked list to block certain addresses from sending e-mail to the organization. Sender ID The sending system s Domain Name System (DNS) server is queried to determine whether the IP address of the system that originated the message is authorized to send e-mail from that domain. This veri cation process protects you against spoofed e-mail addresses, a ploy commonly used by spammers and phishers alike. Sender Reputation This feature collects information about e-mail senders and
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evaluates incoming e-mail based on a number of characteristics to assign a Spam Con dence Level (SCL) rating. This rating determines whether the message is delivered, and the rating is passed to other computers running Exchange Server when the message is sent to them. If you are responsible for administering a computer running Exchange Server, you will nd additional information in the Help les provided with Exchange Server.
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Several third-party antispam solutions are available that you can consider for your organization. For example, Symantec s MailSecurity for Microsoft Exchange provides content scanning and ltering capabilities. MailSecurity lters incoming messages for content, spyware, adware, and attachment le types (not just le name extensions). MailSecurity is available for Exchange Server, Domino, and SMTP servers. You ll nd more information about MailSecurity at www.symantec.com/Products /enterprise c=prodcat&refId=1011. Another product to consider is GFI Mail Essentials (www.g .com/mes). Mail Essentials provides several levels of content ltering with support for blocked lists, safe lists, and additional header checking options, as shown in Figure 12-4, that enable it to detect and block spam based on a broad range of criteria.
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Figure 12-4. GFI Mail Essentials provides an excellent set of ltering features.
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Mail Essentials works with Exchange 5.5 or later, Lotus Notes, and any SMTP e-mail server. In addition to spam ltering, Mail Essentials supports the automatic addition of message disclaimers, mail archiving, inbound and outbound mail monitoring, automatic replies, and a Post Of ce Protocol 2 (POP2) Exchange service that downloads messages from POP3 servers and delivers them to Exchange Server mailboxes. These are just a few of the solutions available for ltering and managing messages. Many mail servers offer their own ltering capabilities, and many other products provide ltering services for existing mail servers. One of the most prevalent spam ltering solutions is SpamAssassin, based on an opensource heuristic scanning application developed originally for UNIX-based servers. You can nd information about open-source SpamAssassin at www.spamassassin.org. Depending on your existing mail server platform and the development expertise within your organization, you might be able to implement your own ltering solution based on SpamAssassin. There are commercial implementations of SpamAssassin, as well. For example, the Network Associates suite of SpamKiller products is based on SpamAssassin. You can nd more information about SpamKiller at www.mcafee.com/us /enterprise/products/anti_spam/.
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12 Managing Junk E-Mail
Managing Junk E-Mail Effectively
E-mail is a critical tool for most people, but it can also be a frustration when you feel overwhelmed by junk e-mail. By using the features provided in Outlook 2007 and taking a few additional steps, you can greatly reduce the amount of junk e-mail you receive and the corresponding risks:
Use the Outlook 2007 junk e-mail lters and phishing protection. The default option of Low on the Options tab in the Junk E-Mail Options dialog box provides some protection, but it might not be enough. You might want to raise the level to High and check your Junk E-Mail folder regularly to ensure that Outlook 2007 is not sending legitimate messages there. Use the International tab in the Junk EMail Options dialog box to block top-level domains from which you never want to receive messages or to block messages in speci c languages. Use the Safe Senders list and Blocked Senders lists. Building both your blocked and safe lists will make a considerable difference in how well Outlook 2007 can lter your e-mail. Update the Outlook 2007 junk e-mail lters regularly. Updates for Outlook 2007 can be obtained by choosing Help, Check For Updates. You can also download updated lters from of ce.microsoft.com/en-us/of ceupdate/. Disable functionality that can inadvertently con rm your identity. Features like
read and delivery receipts and automatic acceptance of meeting requests can con rm your identity to a spammer. Outlook 2007 lets you con gure receipt processing for Internet e-mail differently from messages within your corporate network so that you can leave receipts on for your business contacts while disabling them for messages from outside the organization.
Guard your primary e-mail address. Many people have a secondary e-mail ad-
dress often from a free public provider such as Microsoft Hotmail that they use when posting on message boards, newsgroups, and so on. Even so, you might want to change your e-mail address when posting it in public by changing the @ to AT or inserting extra characters (such as chrisHillREMOVE@wingtiptoys.com). This can help prevent automated gathering of your address by spammers robots.
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