Fighting Spam
Sunday, May 09, 2010 6:47 PM by roger

I have updated my mail server code to report some very basic diagnostics data through performance counters (I'll come back to that in a future post). Amongst the information that's being logged are:

  • The total number of connections since the server was started.
  • The total number of connections refused (due to server and anti-spam policies) since the server was started.

I've looked at these numbers after a couple of hours of the server being online. There were about 60K connections, out of which a bit more than 75% have been refused SMTP transactions because the remote hosts were identified as spam senders.

Number of Connections to SMTP server.
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Hi, my name is Roger Keller and I am a software engineer from Zürich, Switzerland living in Redmond, WA. I work in the Windows Services and Content group which is part of the Windows client team in Microsoft.