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also a cost element, as RBL providers charge for their services if your organization generates a large number of queries daily. Typically, the provider will charge a fee to create a regularly updated zone transfer of its data to a local DNS server. EMC also allows you to define a list of IP Allow List providers, essentially providing the reverse function of the IP Blocked List providers. IP Allow Lists define IP addresses that are known to be safe.

The EMS code to generate this entry is shown here:

Add-IPBlockListProvider -Name 'Spamhaus' -LookupDomain 'zen.spamhous.org' -Enabled $true -BitmaskMatch $null -IPAddressesMatch @() -AnyMatch $True -Priority '1' -RejectionResponse ''

If you want to print more than one worksheet from the active workbook, but not every worksheet in the workbook, you can select the worksheets to print from the tab bar. To select the worksheets to print, hold down the Ctrl key while you click the sheet tabs of the worksheets you want to print. Then click the File tab, click Print, and click the Print button.

The Test-IPBlockListProvider cmdlet can be used to validate that a Block List provider is working properly. If you have multiple Block List providers, you can test them all in one operation as follows:

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That semicolon allows me to put two commands onto a single command line, without piping the output of the first cmdlet into the second one. In other words, both cmdlets will run independently, but they will put their output into the same pipeline. As you ll see if you try this, or look at figure 8.9, the output starts out fine, displaying process objects. But the output breaks down when it s time to display the service objects. Rather than producing the table you re used to, PowerShell reverts to a list. The formatting system simply isn t designed to take multiple kinds of objects and make the results look as attractive as possible.

You ll see a response like this for each provider:

RunspaceId Provider ProviderResult Matched : : : : 3d8ded65-134f-4543-a52f-aaf3e19ea79e Spamhaus {208.73.210.27} True

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A True result means that the RBL lookup doesn t reveal that the specified IP address is for a suspected spammer. A False result is obviously different, and it is sufficient to block the progress of a message if it was the result of a lookup by the Connection Filter agent.

Connection filters protect by blocking IP addresses used by well-known spammers. Sender filters add protection by blocking known email addresses and domains that spammers use. The Sender Filter agent fires on the OnMailCommand event when the MAIL FROM data are received for a message. The agent works by comparing the sender email address (extracted from both MAIL FROM and the From: field in the message these are not necessarily the same and are often not in the case of spam) against a list of prohibited addresses that the administrator defines as bad. You can block individual addresses or a complete domain or even any subdomains. Figure 14-9 shows the general approach to creating a table of blocked senders. You can also see that a rule is defined to block messages that are presented without sender information in their header.

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After the agent identifies offending messages, it then has to decide how to handle them. The options are to reject the message immediately with a Sender Denied response or to accept the message with the proviso that it comes from a blocked sender. The Content Filter agent will then take this fact into account when it calculates the SCL value for the message. In all likelihood, the message s SCL value will be increased and might lead to it being blocked at a later point in the anti-spam cycle because its SCL value exceeds the threshold for acceptance.

The Get-SenderFilterConfig cmdlet reveals the configuration used by the Sender Filter agent. You can compare the results shown here with the properties visible in Figure 14-9.

Name BlockedSenders BlockedDomains BlockedDomainsAndSubdomains Action BlankSenderBlockingEnabled RecipientBlockedSenderAction Enabled ExternalMailEnabled InternalMailEnabled

: : : : : : : : : :

SenderFilterConfig {Joe.Spammer@cohowinery.com} {} {cohowinery.com} Reject True Reject True True False

The Set-SenderFilterConfig cmdlet is used to update the configuration. For example, to add a new domain to the prohibited list, we can use a command like this:

Set-SenderFilterConfig -BlockedDomainsAndSubdomains 'cohowinery.com', 'cohovineyard.com','litwareinc.com'

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