To disable content filtering, run the following command:

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Set-ContentFilterConfig -Enabled $false

To enable content filtering, run the following command:

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Set-ContentFilterConfig -Enabled $true

Note:
When you disable content filtering, the underlying Content Filter agent is still enabled. To disable the Content Filter agent, run the command: Disable-TransportAgent "Content Filter Agent".

How do you know this worked?

By default, content filtering functionality is enabled for external messages.

To disable content filtering for external messages, run the following command:

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Set-ContentFilterConfig -ExternalMailEnabled $false

To enable content filtering for external messages, run the following command:

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Set-ContentFilterConfig -ExternalMailEnabled $true

How do you know this worked?

As a best practice, you should not filter messages from trusted partners or from inside your organization. When you run anti-spam filters, there's always a chance that the filters will detect false positives. To reduce the chance that filters will mishandle legitimate email messages, you should enable anti-spam agents to run only on messages from potentially untrusted and unknown sources.

To enable content filtering for internal messages, run the following command:

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Set-ContentFilterConfig -InternalMailEnabled $true

To disable content filtering for internal messages, run the following command:

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Set-ContentFilterConfig -InternalMailEnabled $false

How do you know this worked?

To replace the existing values, run the following command:

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Set-ContentFilterConfig -BypassedRecipients <recipient1,recipient2...> -BypassedSenders <sender1,sender2...> -BypassedSenderDomains <domain1,domain2...>

This example configures the following exceptions in in content filtering:

• The recipients laura@contoso.com and julia@contoso.com aren’t checked by content filtering.
  
  
• The senders steve@fabrikam.com and cindy@fabrikam.com aren’t checked by content filtering.
  
  
• All senders in the domain nwtraders.com and all subdomains aren’t checked by content filtering.
  
  

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Set-ContentFilterConfig -BypassedRecipients laura@contoso.com,julia@contoso.com -BypassedSenders steve@fabrikam.com,cindy@fabrikam.com -BypassedSenderDomains *.nwtraders.com

To add or remove entries without modifying any existing values, run the following command:

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Set-ContentFilterConfig -BypassedRecipients @{Add="<recipient1>","<recipient2>"...; Remove="<recipient1>","<recipient2>"...} -BypassedSenders @{Add="<sender1>","<sender2>"...; Remove="<sender1>","<sender2>"...} -BypassedSenderDomains @{Add="<domain1>","<domain2>"...; Remove="<domain1>","<domain2>"...}

This example configures the following exceptions in content filtering:

• Add tiffany@contoso.com and chris@contoso.com to the list of existing recipients who aren’t checked by content filtering.
  
  
• Add joe@fabrikam.com and michelle@fabrikam.com to the list of existing senders who aren’t checked by content filtering.
  
  
• Add blueyonderairlines.com to the list of existing domains whose senders aren’t checked by content filtering.
  
  
• Remove the domain woodgrovebank.com and all subdomains from the list of existing domains whose senders aren’t checked by content filtering.
  
  

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Set-ContentFilterConfig -BypassedRecipients @{Add="tiffany@contoso.com","chris@contoso.com"} -BypassedSenders @{Add="joe@fabrikam.com","michelle@fabrikam.com"} -BypassedSenderDomains @{Add="blueyonderairlines.com"; Remove="*.woodgrovebank.com"}

How do you know this worked?

To add allowed and blocked words and phrases, run the following command:

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Add-ContentFilterPhrase -Influence GoodWord -Phrase <Phrase> -Influence BadWord -Phrase <Phrase>

This example allows all messages that contain the phrase "customer feedback".

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Add-ContentFilterPhrase -Influence GoodWord -Phrase "customer feedback"

This example blocks all messages that contain the phrase "stock tip".

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Add-ContentFilterPhrase -Influence BadWord -Phrase "stock tip"

To remove allowed or blocked phrases, run the following command:

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Remove-ContentFilterPhrase -Phrase <Phrase>

This example removes the phrase "stock tip":

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Remove-ContentFilterPhrase -Phrase "stock tip"

How do you know this worked?

To configure the span quarantine level (SCL) thresholds and actions, run the following command:

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Set-ContentFilterConfig -SCLDeleteEnabled <$true | $false> -SCLDeleteThreshold <Value> -SCLRejectEnabled <$true | $false> -SCLRejectThreshold <Value> -SCLQuarantineEnabled <$true | $false> -SCLQuarantineThreshold <Value>

Note:

The Delete action takes precedence over the Reject action, and the Reject action takes precedence over the Quarantine action. Therefore, the SCL threshold for the Delete action should be greater than the SCL threshold for the Reject action, which in turn should be greater than the SCL threshold for the Quarantine action. Only the Reject action is enabled by default, and it has the SCL threshold value 7.

This example configures the following values for the SCL thresholds:

• The Delete action is enabled and the corresponding SCL threshold is set to 9.
  
  
• The Reject action is enabled and the corresponding SCL threshold is set to 8.
  
  
• The Quarantine action is enabled and the corresponding SCL threshold is set to 7.
  
  

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Set-ContentFilterConfig -SCLDeleteEnabled $true -SCLDeleteThreshold 9 -SCLRejectEnabled $true -SCLRejectThreshold 8 -SCLQuarantineEnabled $true -SCLQuarantineThreshold 7

How do you know this worked?

When the Reject action is enabled, you can customize the rejection response that's sent to the message sender. The rejection response can't exceed 240 characters.

To configure a custom rejection response, run the following command:

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Set-ContentFilterConfig -RejectionResponse "<Custom Text>"

This example configures the Content Filter agent to send a customized rejection response.

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Set-ContentFilterConfig -RejectionResponse "Your message was rejected because it appears to be SPAM."

How do you know this worked?

Outlook Email Postmarking validation is a computational proof that Microsoft Outlook applies to outgoing messages to help recipient messaging systems distinguish legitimate email from junk email. Postmarking is available in Outlook 2007 or newer. Postmarking helps reduce false positives. Outlook Email Postmarking is enabled by default.

To disable Outlook Email Postmarking, run the following command:

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Set-ContentFilterConfig -OutlookEmailPostmarkValidationEnabled $false

To enable Outlook Email Postmarking, run the following command:

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Set-ContentFilterConfig -OutlookEmailPostmarkValidationEnabled $true

How do you know this worked?