Beware that there is someone out there mounting attacks on port 25. I had to turn my Tor entry proxy off, becuase someone was using it to attack machines all over the world on port 25.
What kind of attack is being mounted on port 25? The real time monitoring in Tor showed hundreds of outgoing calls to port 25 all over the world. I turned the proxy off, becuase the load was causing Windows to slow down and crash.
Given what I was seeing, all admins reading this should watch for attacks coming on port 25.