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provider There are times legitimate senders may get listed in RBLs for a number of reasons Also note that connections from IP Block Lists are disconnected after a few attempts and do not proceed beyond the MAIL command, whereas connections from IP addresses listed by IP Block List Providers are not In fact, the behavior of Connection Filtering when IP addresses are listed by Block List Providers is to keep the connection alive and reject a message after the RCPT command is received
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The Exception List Inspecting the recipient of a message in the RCPT command allows
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Exchange to look up a list of SMTP addresses that can still receive messages, even if the sender is listed by an IP Block List Provider Take the postmaster address, for instance You want to be able to provide sending domains a way to notify you that they have been listed (perhaps wrongly so in some cases) by an IP Block List Provider This is facilitated by adding the postmaster s SMTP address for example, postmaster@yourdomaincom in the Exception List Not only is this recommended for the postmaster address, it is in fact required by SMTP, according to RFC 2821 There may be other addresses you want to receive messages for, even if the sender is listed by a IP Block List Provider for instance, sales@yourdomaincom, info, and so on If you do decide to do this, make sure you understand the implications these addresses will be susceptible to receiving a higher amount of spam It is highly recommended that you add the postmaster and other such addresses to the Exception List before you configure a single IP Block List Provider To add SMTP addresses to the Exception List from the Exchange Management Console on an Edge Transport server, follow these steps: 1 Expand the Organization Configuration node and select Hub Transport 2 In the details pane, go to the Anti-spam tab 3 Right-click IP Block List Providers, select Properties, and click the Exceptions tab 4 Click the Add button 5 Click OK to close the properties dialog box In environments where no Edge Transport server exists and you are running anti-spam agents on the Hub Transport server(s), you can get to the Anti-spam tab by clicking the Hub Transport node To add an SMTP address to the Exception list using the Exchange Management Shell, use the following command:
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Set-IPBlockListProviderConfig BypassedRecipients postmaster@yourdomaincom
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Multiple SMTP addresses can be added by using a comma as a separator:
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Set-IPBlockListProviderConfig BypassedRecipients postmaster@yourdomaincom, sales@yourdomaincom
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To get a list of SMTP addresses that are on the Exception list for IP Block List Providers, use the following command:
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Get-IPBlockListProviderConfig | select BypassedRecipients
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Part V:
Security
With our critical SMTP addresses safeguarded from IP Block List Providers, we can proceed with configuring the IP Block List Providers we will use Before we do this, a word about IP Block List Providers
Evaluating IP Block List Providers Plenty of these providers offer their services for free, or a minimal charge Before you decide to use one, investigate the reputation of those you are considering Determine how they function and the reasons why they list an IP address Is the listing merely based on the fact that someone complained, perhaps by entering an IP address on their web page, stating that it was a source of spam Or does the provider follow any processes or have formal guidelines for listing IP addresses Put yourself in the shoes of the victim a sender with an IP address that is listed by one of these providers What are the procedures to determine why your IP address is listed How can you remove your IP address(es) from their list Is it as simple as filling out a form on their website, asking them to remove your IP address(es) Expert opinion ranges from strong support for the concept of RBLs to a strong dislike and contempt for them The downside of using RBLs, according to many experts, is the fact that you are denying messages based on someone else s judgment (the RBL provider s) about which IP addresses you should accept messages from and more importantly, which ones you shouldn t This makes the selection and testing of RBLs a very important part of planning, the importance of which cannot be understated The flip side of the argument is, you can in fact drop large amounts of spam by using RBLs Some experts report dropping as much as 85% of spam based on RBLs If you fear you may drop some legitimate mail because a valid IP address perhaps belonging to an important customer or vendor may be listed, mechanisms are in place to address that concern as well My personal experience strongly favors using RBLs Have I used RBLs that may have listed a legit address, inadvertently or for a reason Yes, but such instances have been infrequent and do not outweigh the high percentage of spam that is in fact blocked by using RBLs Once you are reasonably certain that the provider is reputable and follows reasonable practices for the listing and delisting of IP addresses, and you understand the response codes the provider returns for the different reasons an IP address is listed, you can proceed in configuring Exchange to use the provider Configuring Exchange Server 2007 to Use Real/External IP Block List Providers In production, rather than setting up your own RBL or exclusively relying on an internal one, you are more likely to rely on third-party organizations that provide this service, many of which do a great job of listing sources of spam What s more, many of these RBL services are provided for free! You will need to select the IP Block List Providers you want to use and then configure them Some of the popular providers are UK-based Spamhausorg (wwwspamhausorg), Spam and Open Relay Blocking System (SORBS), NJABL (short for Not Just Another Bogus List ; wwwnjablorg) You can use the search engine of your choice to look for more providers A directory of such providers can be found at http://wwwdmozorg/ Computers/Internet/E-mail/Spam/Blacklists/
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