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troubleshooting Question

Sonicwall ES300 Appliance, All incoming email for one user is marked as DHA threat...

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Software FirewallsEmail Protocols
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Running, Exchange 2003, all patched on Windows Server 2003, all updates...

We have a Sonicwall ES300 Mail Appliance.  User complained she wasn't receiving any outside email.  I checked the AUDIT piece of the Sonicwall and all her incoming email messages are marked as DHA threat and deleted.  She can send out and receive internal email without issue.  Any idea how to correct this issue?  I am at a loss, checked online and haven't found any fix...

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