Barracuda Spam Firewall models 600 and above, all firmware versions.
If any email addresses are listed under the Individual Account Activation heading on the Advanced > Explicit Users page, only emails adressed to those users will be scanned for spam and viruses. If this page is blank, the Barracuda Spam Firewall will process mail for all users normally. RBLs, rate control checks, and recipient verification are applied to all incoming email regardless of whether the recipient address is listed there.
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