Utilizing Wormly.com can allow attackers to send fake emails to Barracuda Email Security Gateway, and Barracuda would accept the emails by default.
The easy way to sort out this issue is to enable a function called "Send Spoof Protection".
Go to "ADVANCED"->"Email Protocol" page, and choose the "Yes" option next to "Sender Spoof Protection" before tapping the "Save" button on the top right side.
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