Barracuda firewall today
It is able to determine the sender and the IP address of the e mail for instance. Since there are certain senders and e mail servers that are known sources of spam e mail, this action of Barracuda firewall considerably reduces the risk of such e mail getting through. Unlike many other similar products on the market, the Barracuda firewall carefully looks through the e mail message header in order to determine if any signs of modification are detected. Many spammers have been known to try to defeat e mail servers by modifying message headers, which has traditionally been a weak spot in network security. 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.