How does the Barracuda Spam & Virus Firewall decide how to score incoming e-mail?
It would take a book-length e-mail to explain that in detail, but here’s a slightly shorter version: • Virus Checking – Two different virus scanners examine each incoming message. Messages containing viruses are blocked, and you receive a notice from the Barracuda that this has occurred. • Rate Controls – This protects us from automated spam programs (spambots) that attempt to send huge amounts of email to our mail server in a very small amount of time. If this occurs the sending server is told to try again later, then disconnected. Legitimate mail servers will try again later, so legitimate e-mail still gets through. Spam software usually doesn’t bother to try again, so a lot of spam is blocked. • External Blacklists – The Barracuda uses the same externally maintained blacklists we have used for several years on our main mail server. It also uses an external blacklist maintained by Barracuda Networks that lists the largest and most aggressive spammers. All e-mail coming from blacklist
