We don't recommend whitelisting or blacklisting most messages. If you whitelist an address, it will bypass the filter and you won't have the opportunity to train the filter what is and is not spam. This will make it near impossible to reach the needed quotas for an optimized Bayesian database. More information on that can be found here: http://customers.machighway.com/knowledgebase.php?action=displayarticle&id=377
If you feel the need to manually whitelist an address:
1. Open up your most recent quarantine report and scroll to the bottom of the message where you will find the line:
Click on the words "click here" to visit your online quarantine area.
2. At the top you will see two tabs, Quarantine Inbox and Preferences. Click on the Preferences tab.
3. Under the Preferences tab you will find a sub-menu. Click on Whitelist/Blacklist in that sub-menu.
4. You will now see two fields, one for whitelisting an address and one for blacklisting an address.
To whitelist an address, type the email address into the field under the heading Allowed Email Addresses and Domains (Whitelist) and click Add. Messages from that address will always pass through the filter from that point on, but will still be filtered for viruses.
To blacklist an address, type the email address into the field under the heading Blocked Email Addresses and Domains (Blacklist) and click Add. Messages from that address will always be blocked by the filter from that point on.
Since Spammers frequently change or forge their email address blacklisting spammer's addresses is not an effective way of stopping spam. Blacklisting is useful for those particular situations you need to block messages from an address. If a message is in your quarantine the system already thinks it is spam.