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This section discusses anti-spam issues.

I cannot find the anti-spam features described in this guide.

Some anti-spam features need the Anti-Spam Module to be enabled.

I have configured the appliance to reject spam with an RBL Servers check but some spam mail is still getting through.

No anti-spam software is fully effective, and cannot guarantee to block all spam email messages. The appliance uses a list of the names of known email abusers and the networks they use. These lists are effective in reducing unwanted email messages but are not complete. To block a specific sender of spam:

1 In the navigation pane, select Configure | SMTP. 2 Select Protocol Settings | Permit and Deny Settings. 3 At Deny Sender, type the sender’s email address.

Users are not getting normal email messages.

Users might not receive normal email messages for several reasons:

• The email messages might be coming from someone listed in the Deny Sender list. You might need to:

• Refine the Deny Sender list to ensure that wanted email messages are not blocked. For example, you might need to type specific email addresses rather than ban a whole domain or network.

• Add the sender, domain, or network to the Permit Sender list. The appliance does scan email from senders, domains and networks in this list for spam. The Permit Senders list overrides entries in the Deny Sender lists.

Troubleshooting the Virtual Appliance Anti-virus automatic updating issues

• The email message might have been blocked because it comes from a sender or organization that has been recognized by one of your real time anti-spam lists as a potential source of spam.

• The balance between blocking spam and normal email messages might need changing. For example, if the appliance is blocking email messages when there is only a small chance that they contain spam, you risk unintentionally blocking normal email messages. It is better to risk letting some spam through.

• The email message might contain a virus or potentially unwanted program, and has been blocked by anti-virus scanning.

Users are still receiving spam.

Users might still receive spam for several reasons:

• No anti-spam software can block all email messages that might contain spam. For the best chance of detecting and preventing spam, ensure that the appliance is using the latest versions of the anti-spam engine, anti-spam rules, and extra rules files, as well as using all the features that can block unwanted email.

• The appliance is allowing streaming media to pass through.

NOTE:Allowing streaming media to pass through the appliance is a security risk, because streaming media is not scanned by the appliance. McAfee recommends that you do not allow streaming media of typeapplication/octet-stream or application/* to pass through the appliance because these MIME types are executable and are a security risk

• Scanning for spam is not enabled on the appliance. Scanning must be enabled in the right direction for spam detection. To detect spam from an external source, enable inbound scanning. To detect spam from an internal source, enable outbound scanning.

• You might need a more stringent anti-spam policy. For example, you might want to ensure that more email messages are marked as spam before they are received by users, or to simply block the spam at the appliance.

• The email messages might be coming from senders, domains, or networks that are in the Permit Sender list. Review the list to make sure that you really want email messages from these senders to bypass anti-spam scanning. You might need to refine the entry in the list. For example, rather than permitting whole domains or networks, specify individual email addresses instead.

• The mail client software does not automatically move unwanted messages into a spam folder, so users still see spam in their inboxes.

• The email message might be larger than is permitted, so it is not scanned for spam. See your advanced settings for spam to change the size.

• Email messages are not being routed through an appliance with the Anti-Spam Module enabled.

How can I stop a particular type of spam?

To ensure that you have the best chance of detecting and preventing spam, check that: • The appliance is using the latest versions of the anti-spam engine and anti-spam rules. • The appliance has not been configured to allow streaming media to pass through. Troubleshooting the Virtual Appliance

Users are complaining that their mailboxes are full.

If users automatically divert spam to a spam folder in the mailbox, their mailboxes can quickly exceed their size limit. Remind users to regularly check their spam folder and delete spam. Troubleshooting the Virtual Appliance

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