I've just completed my data center virtualization project. Our current Email infrastructure is running on Exchange 2010; 1 Mailbox VM & 1 Hub and CAS. I have another virtual machine running Exchange POP3 connector which does the mail fetching job from my Hosting provider and then forward them to Exchange Hub and CAS. Since, I do not have Static IP from Service provider, I am relying on SPAM filter services offered by Hosting provider and they are not so effective. So, I am struggling with lot of Junks keep coming to users mailboxes. I had been reading some articles on some free open source SPAM FILTER - SMTP PROXY GATEWAY available. If someone can guide me with the configuration step of setting up SMTP proxy Anti-SPAM server in my environment which is freely available. it will be great help. Please feel free to suggest.
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