Spam filtering for SMB exchange environment - product recommendation needed

Hi, looking for a cost effective spam solution for a small exchange 2007 environment. Ideally installable on the same (single) exchange server. Have enabled the free spam blacklists, etc but too much spam getting through for my clients liking. Ideally the product would integrate with active directory and send a daily digest message to each user for self service release.
Any recommendations appreciated. Client is quite cost conscious as only a dozen users
thanks in advance
jason2302Asked:
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B HCommented:
the perfect software for what you described is ORF by vamsoft.  it's $250 or so one-time, and is absolutely the best server-side spam filter out there.

www.vamsoft.com
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Malli BoppeCommented:
GFI mail essentails.
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Alan HardistyCo-OwnerCommented:
Vamsoft also gets my vote - I am currently using it and I have only had 23 spam emails since the beginning of the year, compared to the 5 or 6 a week I used to get with Symantec's Mail Security for Microsoft Exchange.
You want effective - Vamsoft is very effective (http://blog.sembee.co.uk/archive/2009/11/16/112.aspx
It is simple to install, simple to configure, has a wealth of features, has excellent logs that you can filter, sort and narrow down to see what happened to an email (reject or accept - no quarantine to play with) and it uses Greylisting, a very effective tool at eliminating spam by rejecting the first connection attempt from unknown email addreses.
It also has the ability to add users to Whitelists automatically if you send them an email, so that if they reply, they get straight through.
All in all - a brilliant bit of software (currently running on my Exchange 2010 server).
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