NAV correctly configured for automated updates should catch any viruses sent through encrypted e-mail. Encrypted e-mail is nothing more than a secure pipe (or transport) from one point to another. Once the e-mail is received on your desktop/server, a virus would be detected if NAV is correctly updated and maintained.
For more information on this topic, visit these other SearchSecurity.com resources:
Best Web Links: Secure messaging
Best Web Links: Encryption
Dig Deeper on Email and Messaging Threats-Information Security Threats
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