Hi, I have tried FSL 's BarricadeMX software at two of my client's site. This piece of software is a giant step in the battle against spam. What is it? It is an SMTP proxy, which does many, many tests during the SMTP transaction in a very efficient way. If one test fails, it rejects the message with a 5xx SMTP reply, so the sender should be notified. Il also implements Greylisting in a more intelligent manner than most current Greylisting implementations. I installed and configured it for 2 clients which are in a different situation: One is a high-volume, multiple servers setup, and the other is a smaller setup with only 1 scanning server. On the big setup, it allowed this client to stop the delays they were experiencing and the spam-catching rate is a lot higher. It also simplfied management. On the smaller setup, I enabled BarricadeMX's clamd and spamd support. This way, viruses are blocked at the MTA level, and any spam that scores over a defined parameter.