One of my clients is a medium sized business and has been experiencing a large increase of SPAM in the last couple of weeks. They are using a Barracuda SPAM Firewall 300 and it blocks about 50,000 SPAM per day and allows about 800 a day of legit email.
The Firewall device that was sitting in front of the Barracuda was totally flooded with all these incoming SMTP requests that RDP and other remote access into our LAN was sporatic, and if someone did get in they would eventually get disconnected. We replaced the current Firewall device with a larger more efficient and robust Firewall device and installed it and noticed that the remote connections were much more stable but the amount of SPAM of course is the same.
The problem/question actually is, How can I divert all this SPAM coming to the Firewall, our ISP doesnt support SPAM filtering either.