Setting up MS Exchange for use with Barracuda spam filter.
If you aren’t using the settings below, LDAP needs to be enabled to do valid user checking for inbound mail. Otheriwse Exchange will accept all mail, regardless of recipient address and the Barracuda will create tons of bogus quarantines.
Taken from: http://support.microsoft.com/kb/823866
***Create a recipient filter
When you use recipient filtering, you can prevent messages from being delivered to e-mail addresses that exist in your organization, and you can filter messages that are directed to e-mail addresses that do not exist in your organization. Recipient filtering only applies to messages that come from anonymous connections.
To create a recipient filter, follow these steps:
1. Start Exchange System Manager.
2. Expand Global Settings, right-click Message Delivery, and then click Properties.
3. Click the Recipient Filtering tab.
4. To filter e-mail based on a particular e-mail address, click Add, type the e-mail address, and then click OK.
5. To filter messages that are directed to e-mail addresses that do not exist in your organization, click to select the Filter recipients who are not in the directory check box.
Then:
Apply the connection filter or the recipient filter or both to the
appropriate SMTP virtual servers You must enable the connection filters and the recipient filters on each SMTP virtual server where you want these settings to be applied.
To apply a filter to a SMTP virtual server, follow these steps:
1. Start Exchange System Manager.
2. Expand Servers, expand Server Name, expand Protocols, and then expand SMTP.
3. Right-click the SMTP virtual server where you want to apply the filter, and then click Properties.
4. On the General tab, click Advanced.
5. Click the IP address that you want to apply the filter to, and then click Edit.
6. In the Identification dialog box, click to select either the Apply
Connection Filter check box or the Apply Recipient Filter check box.
7. Click OK, click OK, click Apply, and then click OK.
8. Restart the SMTP virtual server where you applied the filter.
9. Repeat steps 2 through 8 for each virtual server where you want to apply the filter.
In Microsoft Exchange 2007 you can enable a similar setting here:
In the ESM (exchange management console)
– Organization Configuration
– Hub Transport
– Anti-Spam Tab
– Enable Recipient Filtering
