This solution applies to all Barracuda Link Balancer models, firmware version 2.1.0.010 and above.
The Link Balancer must be a remote VPN gateway to the VPN tunnel.
Advanced > Advanced IP Config: Static Routes
If this is not done, the Barracuda Link Balancer will send the email notification via the next available WAN Link. This means the TCP connection needed by the Barracuda Link Balancer to send the email notification is not established via VPN tunnel.
Adding a static route:
- IP/Network Address: The IP address of your SMTP server
- Netmask: The proper netmask.
- Gateway Address: The gateway IP address configured on the SMTP server or an IP address that can route packets to the SMTP server.
- Link: The LAN or Virtual Interface that is used by your VPN tunnel.
Solution #0003700 also provides details on how to create a static route.
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