I have a pretty straight forward setup:
ASA Firewall > Barracuda spam filter > Zimbra
However I cannot get Zimbra to receive mail from the Barracuda. I've tried configuring the Spam Filter's IP in the "Inbound SMTP host name:" filed and also leaving it blank, etc.
I'll send test emails from my gmail account and they'll show up in the Spam filter's log marked as "delivered" but they don't even register in Zimbra's log.
I can receive outside email if I configure the ASA to deliver straight to Zimbra.
Where am I going wrong?