Under the Megabyte Thunder spam filtering service, you can control what happens to email that gets quarantined including adding email to your White list (letting email through the spam filter if they are being blocked) and your black list (blocking spam email that may have got through).
When an email is caught in the spam filter it gets quarantined. Each morning you will receive an email which details all emails that have been quarantined, the email will look like this:
Subject: Megabyte Spam Filter Summary: [10 message(s)]
The whitelist is a list of approved email addresses, so if you notice that you have emails from a particular address that continually get caught in Spam it may be worth adding them to the whitelist.
The blacklist is the oposite of the the whitelist, if you continue to receiving Spam summary’s for emails that you do not wish you to receive it may be worth adding them to the blacklist.