When you view or preview the message, Bagle The Virus instantly fetches its payload from a remote server. Gotcha.

Why didn’t your anti-virus software catch it? Because a Bagle message contains no signature. Anti-virus software that relies on virus signatures simply can’t see Bagle, let alone stop it.

eWeek quotes Bill Franklin of Zero Spam Networks: “This threat passed right through gateway, router, firewall and server anti-viral protection and relied on the end user’s PC as the last line of defense… Any defensive strategy that lets intruders pass all the way to the last line of defense unchecked is not just suboptimal, it’s asking for catastrophe. We all know that relying on the end user to stop virus attacks is not workable… This is the most significant new threat we face as a community.”

Bill’s right. While a multi-layer defense is critical, it’s best to stop attacks at the border, before they devour computers and manhours inside your LAN.

That’s why trimMail Inbox disables potentially dangerous contents like Bagle the second it sees them. Bagle has never made it through a properly configured trimMail Inbox intact. Ever.

Admins of trimMail Inboxes long ago stamped this viral infection “Cured.”

See for yourself at eWeek.