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Implementing Edge Services for an Exchange Server 2007 Environment : Utilizing the Basic Sender and Recipient Connection Filters (part 3) - Configuring Recipient Filtering

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7. Using the Exchange Management Shell to Add Blocked Senders

Sender filtering can also be configured through the Exchange Management Shell. Each shell command has its own parameters you can set based on the action(s) performed by the command. There are two commands: Get and Set.

The Get- command is used to retrieve the configuration of the Sender Filtering Agent. For example, entering Get-SenderFilterConfig displays the Sender Filtering configuration on the local system.

The Set- command allows an administrator to enable or disable the agent and modify the configuration of the agent. The following example enables the Sender Filtering Agent and rejects messages from blank senders on external SMTP connections.

Set-SenderFilterConfig -Enabled $true -Action Reject
-BlankSenderBlockingEnabled $true -ExternalMailEnabled $true -Enabled $true

8. Configuring Recipient Filtering

Recipient filtering allows an administrator to block email delivery from the Internet to a specific email address. Email that is routed through Receive Connectors is processed by the Recipient Filtering Agent. In addition, recipient filtering can prevent delivery of email messages to nonexistent accounts in Active Directory. This is extremely effective in stopping spam and virus-laden email to abused or commonly named email accounts (for example, support@companyabc.com or domain@domain.com).

Note

A maximum of 800 email addresses can be placed in this list.


The Recipient Filtering Agent is enabled by default and can be configured using the Exchange Management Console or Exchange Management Shell.

Note

Changes described in this section are applied only to the local system. This is important if you have more than one Edge Transport server in your environment.


To disable the Recipient Filtering Agent using the Exchange Management Console, right-click the agent icon in the action pane and select Disable. To disable the Recipient Filtering Agent using the Exchange Management Shell, run the set-RecipientFilterConfig command with the -Enabled $false parameter.

Example: set-RecipientFilterConfig -Enabled $false

The General tab of the Agent Properties window displays a brief description of the agent and its capabilities, its current status, and the last time the agent’s settings were modified.

To add email addresses to the Recipient Filtering list, double-click the recipient Filtering Agent in the action pane and select the Blocked Recipients tab, as shown in Figure 2. From here, you can add, edit, or delete entries in the list. You can also enable the Block Messages Sent to Recipients Not Listed in the Recipient List field. Enabling this feature prevents delivery of email messages to nonexistent accounts in Active Directory.

Figure 2. Blocked Recipients tab in the Exchange Management Console.


Note

For the Block Messages Sent to Recipients Not Listed in the Recipient List feature to work, you must first configure the EdgeSync process and Active Directory Application Mode (ADAM) for recipient lookup. 


Tip

Using the Block Messages Sent to Nonexistent Senders can help drastically reduce the amount of email sent to commonly targeted addresses like webmaster@companyabc.com, support@companyabc.com, and john@companyabc.com. This also reduces the spammer’s ability to identify which email addresses are valid when no response or a response other than “nonexistent user” is returned in a nondelivery report (NDR).


9. Using the Exchange Management Shell to Add Blocked Recipients

Recipient filtering can also be configured through the Exchange Management Shell. Each shell command has its own parameters you can set based on the action(s) performed by the command. There are two commands: Get and Set.

The Get- command is used to retrieve the configuration of the Sender Filtering Agent. For example, entering Get-RecipientFilterConfig displays the Recipient Filtering configuration on the local system.

The Set- command allows an administrator to enable or disable the agent or modify the configuration of the agent. The following example enables the Recipient Filtering Agent and rejects messages to nonexistent recipients on external SMTP connections.

Set-RecipientFilterConfig -Enabled $true -ExternalMailEnabled $true -
RecipientValidationEnabled $true
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