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Barracuda firewall also looks into the content of any received e mail for any of the usual signs of spam. 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. The Barracuda firewall also has the ability to compare e mails against user created whitelists and blacklists. As you can imagine, these features can make short work of sorting out your e mail into groups of trusted senders and banned senders.