This solution applies to the Barracuda Spam Firewall's Exchange (Anti-Virus) AV Plugin.
- On-Access Scanning (Configurable): When a non-caching mail client connects and is not utilizing cached mode, each message which is pulled down will be scanned by the Exchange AV before being presented to the client device.
- Proactive Scanning (Configurable): When an email message is initially received or sent by the mailbox server it will be scanned by the Exchange AV plugin before being routed to it's final destination.
- Background Scanning (Configurable): When the virus definitions that govern the Exchange AV plugin are updated the plugin will rescan all email on a low-priority thread to attempt to catch any viruses that may have been missed in a previous definition.
- Quarantine rescan (Not configurable): When the virus definitions are updated as above, the plugin will also rescan messages present in the quarantine in order to identify and correct any false positives.
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