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describe this anti-spam protection as being very basic more suitable for small organizations. You should consider purchasing E-CALs for automatic updates which provide multiple anti-spam updates per day if you re planning for a larger company. E-CALs also include the required licenses for Forefront Protection 2010 for Exchange Server (FPE 2010), which you can optionally deploy to add an extra level of protection for anti-spam. You configure the anti-spam update service using the Enable-AntispamUpdates cmdlet and receive information on what pattern versions are installed using the Get-AntispamUpdates cmdlet as shown in Figure 7-8.
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FIGURE 7-8 Configuring automatic anti-spam updates
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You can see that multiple update patterns are available in the anti-spam update of Exchange 2010. Table 7-4 lists all available pattern updates.
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TABLE 7-4 Anti-Spam Pattern Updates
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Content Filter updates. The filter is based on Microsoft s SmartScreen technology and is used for scanning the body of the messages and assigning SCL ratings. Identifies the most recent spam campaigns. Provides sender reputation information about IP addresses that are known to send spam.
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Spam Signature (E-CAL required) IP Reputation (E-CAL required)
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All patterns are part of a single update process no separate processes are required. lessoNs learNed
Anti-Spam with Forefront Protection 2010 for Exchange
alexander Nikolayev
Program Manager, Forefront Server Security, Microsoft Corporation
316 ChapTEr 7
t Microsoft, we use Forefront protection 2010 for Exchange (FpE) for anti-spam. If you use FpE 2010, you might consider these three best practices for enabling
the most effective anti-spam defense.
Edge Transport and Messaging Security
First, where will you reject spam The most efficient FpE positioning is to scan the messaging stream at the entry point into Exchange organization. an early rejection of unwanted e-mail will prevent wasted resources to push unnecessary payloads through the network and save some bandwidth. Best hygiene practices call not only for physical positioning of FpE on the perimeter of the organization s network but also to enable early rejection of spam inside the FpE, which is a layered anti-spam solution. The first layer, Connection Filtering, is based on new Forefront DNSBL technology. When enabled, our testing shows that Forefront DNSBL will reject around 90 percent of spam based on the connecting Ip address even before it begins to examine the content of the message. Forefront aggregates rBL feeds from multiple vendors, and the DNSBL feature is configuration-free, so it s not only very effective but also simple to use. Second, what messages will you reject One person s ceiling is another person s floor, right What is considered as spam by some recipients is legitimate mail to others. To help FpE figure out for whom to reject and for whom to accept a given piece of mail, it is important to enable recipients Outlook Safe/Block Lists aggregation. The FpE Content Filter, based on Cloudmark CMaE engine, will take these lists into consideration on a per-recipient basis to provide the desired granularity level. Using the default SCL settings on the content filter will reject the rest of spam; however, if you need to relax the filter you can lower SCL thresholds to quarantine questionable mail for triaging. and finally, where to triage previously, Microsoft recommended quarantining questionable e-mail in a dedicated Exchange mailbox so that an administrator could access, review, retrieve, and resend false positives. This was not always an easy task because of the volume of quarantined messages. Forefront makes triaging easier because the messages by default are stored in Forefront quarantine. however, with the volume of quarantined messages now drastically reduced, it makes sense to review our default approach to triaging and perhaps allow these messages to be deposited into a recipient s Junk Mail folders. The amount of suspected spam is very small. For example, based on internal Microsoft data, only about 50 messages per 1 million of external mail submissions are quarantined. To determine the volume of quarantined mail, run the Get-FseSpamReport cmdlet and look for the number of messages with SCLs between five and eight inclusive these are the messages that will be quarantined by default. If you see that the amount is small, maybe it s time to entrust your recipients with the responsibility of triaging suspected spam, considering that they will get only a couple of such messages per month. In addition, do not forget to enable Backscatter filtering. Backscatter filtering will protect your organization from bogus NDrs to recipients who never sent the NDr mail in the first place. This happens when a malicious user spoofs the MaIL FrOM address as someone from your organization; the receiving server might generate an NDr back to an unsuspecting victim. For the filter to work correctly you need to have the same set of keys installed on every transport server that participates in sending to or receiving mail from the Internet.
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