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We use GFI Mail Essentials, it has a Bayesian filter which learns from incoming and outgoing mail. &nbsp;<br />
<br />
I find it an effective solution and it filters the vast majority of spam. &nbsp;It has white lists, black lists, keyword checking and can be configured quite finely.<br />
<br />
<a href="http://www.gfi.com" rel="ugc">http://www.gfi.com</a><br />
<br />
We also use a gfi product for part of our anti virus solution - Mail Security<br />
<br />

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We use GFI Mail Essentials, it has a Bayesian filter which learns from incoming and outgoing mail.  

I find it an effective solution and it filters the vast majority of spam.  It has white lists, black lists, keyword checking and can be configured quite finely.

http://www.gfi.com [http://www.gfi.com]

We also use a gfi product for part of our anti virus solution - Mail Security



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I quite like ORF from Vamsoft. It has worked well with a number of clients. <br />
<br />
Simon.
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I quite like ORF from Vamsoft. It has worked well with a number of clients.

Simon.

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is there anything that goes on a seperate server, I am not a huge fan of GFI.
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is there anything that goes on a seperate server, I am not a huge fan of GFI.

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I am thinking of putting in an anti-spam server, maybe just a box all email hits before it goes to Exchange. &nbsp;Does anyone have some good recomendations for software that I can run on the server side ? &nbsp;<br />
<br />
Thanks 
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I am thinking of putting in an anti-spam server, maybe just a box all email hits before it goes to Exchange.  Does anyone have some good recomendations for software that I can run on the server side ?  

Thanks 

Anti Spam

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.