Enable Exchange Recipient Filtering for SMTP Call Forward

Document created by user.oxriBaJeN4 Employee on Sep 9, 2015Last modified by user.oxriBaJeN4 Employee on Aug 21, 2017
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SMTP call forward is a form of Mimecast recipient validation that makes a connection to your organization's Exchange server(s) to determine the validity of a recipient on an inbound email. Before this type of recipient validation can be used for a Mimecast internal domain, Exchange recipient filtering must be enabled.

 

What You'll Need

 

  • Admin permissions to your organization's Exchange environment.

 

Walkthrough

Exchange 2010

 

Installing Anti-Spam Features on a Hub Transport Role Server

 

To install anti spam features on a hub transport role server:

  1. Open the Exchange Management Shell.
  2. Change to the Exchange scripts directory.

     

    1cd C:\Program Files\Microsoft\Exchange Server\V14\Scripts

     

  3. To install the Anti-spam features, run the following command.

     

    1.\install-AntispamAgents.ps1

     

  4. Restart the Microsoft Exchange Transport service by using the following command.

     

    1restart-service msexchangetransport

     

  5. Open the Exchange Management Console and confirm that the Anti-Spam tab is now available under Organization Configuration | Hub Transport.

 

Enabling Recipient Filtering

 

To enable recipient filtering:

  1. Open the Exchange Management Console.
    Hub_Transport_Anti_Spam.png
  2. Navigate to Organization Configuration | Hub Transport and select the Anti-spam tab.
  3. Right-click on the Recipient Filtering option and select Properties:
  4. Click on the Blocked Recipients tab and check the Block messages sent to recipients that do not exist in the directory option:Recipient_filtering_Blocked.png
  5. Click OK to apply the change.

 

Exchange 2007

 

Installing Anti-Spam features on a Hub Transport Role Server

 

To install anti-spam features on a hub transport role server:

  1. Open the Exchange Management Shell.
  2. Change to the Exchange scripts directory.

    1cd C:\Program Files\Microsoft\Exchange Server\Scripts
  3. To install the Anti-spam features, run the following command.

    1.\install-AntispamAgents.ps1
  4. Restart the Microsoft Exchange Transport service by using the following command.

    1restart-service msexchangetransport
  5. Open the Exchange Management Console and confirm that the Anti-Spam tab is now available under Organization Configuration | Hub Transport.

By installing Anti-Spam, some features are enabled by default. Ensure that you review these settings and disable any that are not required.

Enabling Recipient Filtering

 

To enable recipient filtering:

  1. Open the Exchange Management Console, navigate to Organization Configuration | Hub Transport and select the Anti-spam tab.
    Hub_Transport_-_Anti-Spam.png
  2. Right-click on Recipient Filtering and select Properties:

    If you have a separate Edge Transport server in your environment, then the Anti-spam tab can be found under Organization Configuration | Edge Transport menu.

  3. Click on the Blocked Recipients tab and select Block messages sent to recipients not in the Global Address List:Enable_Recipient_Filtering.png
  4. Click OK to apply the change.

 

Exchange 2003

 

Enabling Recipient Filtering Globally

 

To enable recipient filtering globally:

  1. Open Exchange System Manager, expand Global Settings.
    Message_Delivery_Properties.png
  2. Right click Message Delivery and select Properties.
  3. Select the Recipient Filtering tab
  4. Check the Filter recipients who are not in the Directory option:
    Enable_Recipient_Filtering.png
  5. Click OK

 

Enabling Recipient Filtering at the SMTP Virtual Sever level

 

Once recipient filtering has been enabled under Message Delivery, it then needs to be activated on each SMTP virtual server.

  1. Open Exchange System Manager, expand Administrative Groups |  First Administrative Group | Servers | <your server name> | Protocols | SMTP.
  2. Right click on Default SMTP Server and select Properties.
  3. Click the Advanced button and then Edit.
    Virtual_Server_Advanced_Edit.png
  4. Select Apply Recipient Filter.
    Virtual_Server_Identification.png
  5. Click OK.Restart the SMTP server for the changes to be applied.

 

Next Steps

 

Once Exchange recipient filtering is enabled you can proceed to configure SMTP Call Forward as a Recipient Validation method for an internal domain.

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