[GRLUG] $50K Prize if You Find Way to Block Robocalls

[Patrick Goupell]

On 11/07/2012 11:44 AM, Tim Schmidt wrote:
> I think the answer is doubly that they have more data, and that they
> keep it secret.
>
> Sharing the data means sharing it with the spammers, and in my short
> time as an email admin, subscribing to the popular spam lists only
> blocked about half our incoming spam.  Even with greylisting, lots of
> filter tweaking for company-specific domain terms, scads of training,
> and measures I've since forgotten, we still regularly received spam.
> Those guys are really good at what they do.
>
> I'll freely admit that having an expectation of 0 false positives or
> negatives is unattainable.  However, that _is_ the goal.  And even
> google misclassifies a message or two a month on me.
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>
>    
I have followed an email anti spam project for a few years.  It is 
called esva - email scanning virtual appliance.

I used it for a while on a very small mail server and it worked great.

You can check it out at www.esvacommunity.com