Colocation hosting, the basic primer
The Barracuda firewall is not susceptible to such deceptive tactics, since most modifications to the e mail headers are generally considered as a spamming attempt. 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.