I have the following setup:
Internet -> Postfix Mail setup as Proxy -> Barracuda Spam Filter -> Microsoft Exchange
I have tried searching through the documentation and configuration panels to see how I could get the Barracuda to use the original client IP to compare against black lists. I could not find anything related to mail proxies before the Barracuda.
Is there any way to configure either my Postfix relay or the Barracuda so that the Barracuda can see and use the original client IP as the origin of the email?
My initial guess is I would have to set a header, sort of like using nginx as a web proxy. e.g. X-ORIGINAL-IP or the like, but I am unsure what I would have to set.
Look for the Barracuda "Deep-Header Scan" feature. Depending on your unit and firmware revision, it's likely masked under the
This used to be a separate feature, but in the v5.1 changelog, Barracuda removed it from the UI: