As a message passes through the last of all of the defense layers, it is scored for spam probability. This score ranges from 0 (definitely not spam) to 10 or higher (definitely spam). Based on this score, the Barracuda Email Security Gateway either tags (inbound messages only), quarantines, blocks or allows (or sends, for outbound) the message.
After you have more experience with the Barracuda Email Security Gateway, you can adjust how aggressively the system deals with spam. For example, you may decide to tag (inbound only) or quarantine spam instead of blocking it. For details on the spam scoring limits of your Barracuda Email Security Gateway, click Help on the BASIC > Spam Checking page.