Scope:This solution applies to the Barracuda Spam and Virus Firewall, all firmware versions.
You may receive a NDR from your Spam & Virus Firewall that states the following:
5.0.0 smtp; 5.3.0 - Other mail system problem 552-'MS-Office file containing VBA macros found inside of the email
This message is seen when a Sonicwall firewall is doing inline SMTP scanning on your mail flow.
Disabling this feature on the Sonicwall firewall should resolve this issue.
Link to this page:https://campus.barracuda.com/solution/50160000000IYkqAAG