We have been running the open source software ASSP on two Exchange Mailservers for just over a year now. All spam mails and viruses are already rejected at the SMTP level. Reject levels are 92.4% on one server and 80.6% on the other server. I consider the spam problem solved. Why can't ISPs provide a similar level of service? My ISP for example (pair) are still letting through a lot of spam that my ASSP setup at the office handles with ease.
