Well I use said product at work to filter out spam messages for our exchange server and well I was going through the logs and noticed something. An address was blacklisted one min and allowed through next. So I went home created a domain and started to send out emails my barracuda blocked them all saying blacklisted address. SO i put rwd: in the subject line and bam they started going through no problem. Heres what I tested it on. Barracuda Spam Firewall 300 Firmware v3.4.10.087 Current energizer updates
maybe the setting of your spam filter is blocked so that it only lets certain words through or it blocks unknown MIME headers. Something like that, but im having the exact same problem here. But I think it must be something like that.
