The Barracuda Spam Firewall 200 is designed as an entry-level email security appliance for small networks that don't require features beyond simply spam and virus filtering on emails. Provides support for up to 50 domains and 500 email users.

The Barracuda Spam Firewall 400 is designed to provide superior spam, phishing, and virus protection for email servers. In addition, the built-in LDAP authentication protects your Microsoft Exchange or LDAP-enabled email server from brute force attacks and redundant hard drives provides a higher standard of reliability. Provides support for up to 500 domains and 5,000 email users.

The Barracuda Spam Firewall 800 is a enterprise-class solution providing the ultimate blend of email security maximum uptime. Provides support for up to 5,000 domains and 22,000 email users.

The Barracuda Spam Firewall 1000, which comes in a 2U fullsize form factor, includes 200 GB message log storage and 750GB storage capacity for quarantined messages, thus delivering the largest quarantine storage capacity available for large enterprises. Provides support for up to 5,000 domains and up to 100,000 email users.