Microsoft KB Archive/906041

= Legitimate e-mail messages are blocked after you enable RBL servers in Antigen =

Article ID: 906041

Article Last Modified on 2/28/2007

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APPLIES TO


 * Sybari Antigen 8.0 for Microsoft Exchange
 * Sybari Antigen 8.0 for SMTP Gateways

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SYMPTOMS
After you enable Real-Time Blackhole List (RBL) servers, legitimate e-mail messages are blocked from entering your environment in Sybari Antigen.



WORKAROUND
To work around this issue, configure an Allowed Mailhosts list or a Sender whitelist so that these e-mail messages can enter your environment. When you enable the Allowed Mailhosts list or the Sender whitelist, e-mail messages that meet the requirement of these lists bypass RBL servers. If you do not want e-mail messages that are sent from a specific domain to be blocked, use the Allowed Mailhosts list. If you do not want e-mail messages that are sent from specific domains and from specific e-mail addresses to be blocked, use the Sender whitelist. When you use the Sender whitelist, you can prevent certain types of scanning from being performed on e-mail messages that come from specific domains or from specific e-mail addresses.

Note If you enable an Allowed Mailhosts list or a Sender whitelist, all e-mail messages will still be scanned for viruses.

To configure an Allowed Mailhosts list, follow these steps:  In Shuttle Navigator, click Filtering, and then click Filter Lists. In the right pane, click Allowed Mailhosts under List types. To create a new custom Allowed Mailhosts list, click Add.

If you want to add a domain to the default Allowed Mailhosts list, go to step 5. Type a name for the new list, and then press ENTER. Under Filter lists, click the Allowed Mailhosts list that you want to configure, and then click Edit/Import. Click Add, type the name of the domain that you do not want blocked, and then press ENTER.

Use a wildcard character (*) when you type the domain name. For example, type * .com. When you use a wildcard character, child domains of this domain will not be blocked. Click OK, and then click Save in the Filter Lists work panel.</li> To enable the Allowed Mailhosts list, follow these steps: <ol style="list-style-type: lower-alpha;"> In Shuttle Navigator, click Filtering, and then click Mailhost.</li> Under Filter Lists, click the Allowed Mailhosts list that you configured, and then click Enabled under Filter.</li> Click Save.</li></ol> </li></ol>

To configure a Sender whitelist, follow these steps:
 * 1) In Shuttle Navigator, click Filtering, and then click Filter Lists.
 * 2) In the right pane, click Sender Whitelists under List types.
 * 3) Under List names, click Add, type a name for the list, and then press ENTER.

Note Antigen does not include a default Sender whitelist.
 * 1) Click the Sender whitelist that you created in step 3, and then click Edit/Import.
 * 2) Click Add, type the e-mail address that you do not want blocked, and then press ENTER.
 * 3) Click OK.
 * 4) In Shuttle Navigator, click Sender Whitelists under Filtering.
 * 5) Under Sender Lists, click the Sender whitelist that you created.
 * 6) To prevent certain types of scanning from being performed on e-mail messages that are received from a specific e-mail addresses, click to select any one of the following check boxes:
 * 7) * Spam Scanning
 * 8) * Mailhost Filtering
 * 9) * Content Filtering
 * 10) * Keyword Filtering
 * 11) * File Filtering
 * 12) Under List State, click Enabled.
 * 13) Click Save.

Keywords: kbtshoot KB906041

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