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Upon the detection of any such modification on the e mail headers, the Barracuda firewall will then almost always automatically consider these e mails as spam. The Barracuda firewall also carefully examines the content of every e mail that ends up in your system. If there are certain spam terms that show up frequently, the Barracuda firewall will weigh the probabilities of such e mail being spam. If the e mail in question is considered spam, the appropriate action according to your user setting will be taken. If you have already developed your own whitelist and blacklists of users, you will be glad to know that the Barracuda firewall can compare them against your own received e mail.