Email Guard is an add-on and can be downloaded here: http://www.pctools.com/mirror/avegaddon.exe

The Email Guard feature continuously monitors incoming and outgoing email for a range of email clients.

All email messages (HTML, plain text, rich text) are scanned and any detected viruses, worms or Trojans can be automatically removed.

The Email Guard feature also includes advanced settings to adjust ports and trusted hosts.

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Useful Links

Turning Email Guard On and Off

Configuring Email Guard Settings