On 07/11/2006 15:15, Chris Lightfoot wrote:
> how do you allow the recipient to discover when mail they
> wanted has been blocked?

That usually comes to light when the original sender files a complaint.

Right now, in my day job, if we notified every recipient that a message 
to them had been blocked we'd end up with an increase of 4 times the 
amount of mail in people's inboxes (on average, many would be less but 
some would be far greater).

One one system I run (for a very small user base) I educate people to 
put the spams that get through in a specific, shared, folder so that we 
can all learn from them (including the system). Between us we then 
assume that everything in their inbox is not spam. As far as I know, in 
three years of running this, we have only ever had a single set of FPs 
and they came, repeatedly, from Yahoo! e-group digest messages which 
seem to have _dreadfully_ bad HTML formatting.

Aside from that, none. As the system I'm on about is only used by my 
wife and I, we'd get told fairly quickly if a message was rejected when 
it shouldn't be. Or maybe that's the point of this - maybe, in actual 
fact, we'd get no such thing.

Interesting - from that I can deduce, albeit not very scientifically, 
that measurement of false positives is impossible without efficient and 
consistent third-party reporting. Or, maybe, I can just process the logs 
(considering I know who emails me, most of the time).

Graeme

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