Free Antispam solution for MS Products

I was always wondering how can I solve spam problems on Exchange or on IIS without spending a lot of money using commercial products, finally I discovered that I can use a SMTP transport event sink to process e-mail messages with antispam rules.

The first example is pubblished on MS site and explain how to add a disclaimer on all messages; after I did this simple exercise, I tried some other useful script taken from here that allow my smtp to rules against attachment, keywords and RBL....

I really suggest everybody to study this realy useful feature !

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