SPAM! SPAM! SPAM! 673 . Select Delete, and the message is simply deleted; neither the sender nor the recipient is ever notified. . Select Reject, and the message is not accepted, but the sender receives an NDR. WARNING I strongly recommend that if you use Sender ID filtering, that you configure it only with the Accept option. Many, many domains on the Internet (valid senders) do not have DNS SPF records. Exchange hides the results of the Sender ID lookup, but it is possible to expose this information in Outlook. The Exchange team has a good blog entry on the result codes that Sender ID generates and how to expose these in Outlook. See the blog entry at http://tinyurl.com/azyc2. Spam! Spam! Spam! It typically takes from 1,000 to 10,000 spams to make one sale. If you buy from a spammer, you are personally responsible for the next 1,000 to 10,000 spams sent…including the porn spam sent to your kids. Paul Myers, TalkBiz News Unsolicited Commercial E-mail (UCE) is the official name for the scourge that now darkens our inboxes every morning. For purposes of this chapter, though, I ll just refer to it as spam. Spam has become a significant problem for most corporate, government, and individual e-mail users; it consumes disk space, uses bandwidth, and, most of all, consumes a lot of our time. In 2003, the Radicati Group (www.radicati.com) estimated that spam accounted for nearly 45 percent of all Internet SMTP traffic and that this figure will grow to more than 70 percent by 2007. In some respects I think the Radicati Group was being conservative in their estimates. Some administrators are already reporting that more than 80 percent of the daily mail they receive is spam and I have personally seen one organization that was at the 90 percent threshold (without any filtering.) They further estimate that 30 percent of the average company s mail server resources are used by junk mail, for an estimated cost of approximately $49 per user, and this is expected to exceed $250 by 2007. One study (www.evsmail.com/roi.html) shows that the average North American worker who has e-mail spends about 30 minutes per day dealing with spam. If that worker earns $20 per hour, dealing with spam will cost his company $2500 over the course of a year. The Gartner Group (www.gartner.com) estimates that workers spend nearly 50 minutes per day dealing with unwanted junk mail. One large organization reported the amount of spam they received increased from 100,000 messages per month in February 2002 to more than 400,000 by July of 2003; that is more than 50 percent of the total mail they receive monthly. A 75-mailbox organization I know has implemented a real-time blocking solution that quarantines messages from known open relays and performs some basic Bayesian logic on the messages. Their quarantine public folder contains three days worth of isolated messages, or about 7,000 items! If each of these messages averages 5KB in size, that is about 35MB of storage for three days worth of spam. Not to mention that it takes an estimated 85MB of network bandwidth to receive those messages from the Internet! Clearly, something has to give. NOTE Exchange guru Jason Zann has produced an excellent e-book titled Content Security in the Enterprise Spam and Beyond. You can view this e-book for free at http://tinyurl.com/lnac6.
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