[Bug 6123] Add "tflags exponential" to allow increasing score for multiple hits

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https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6123





--- Comment #1 from Matt Kettler <mk...@verizon.net>  2009-06-03 19:51:28 PST ---
In that case I would suggest calling it tflag multiply, not tflag exponential.


Personally, I don't think it's a outright bad idea, but I don't see a whole lot
of value in it. Perhaps I just need some examples of how it's really useful.

In my thinking, it might be useful for implementing rules with small scores
that don't hurt nonspam, but add up enough to mean something with repeated
hits. However I just can't think of an example where the spread of hit count
would be sufficiently large. ie: I can think of cases where spam might have 3
matches, and nonspam only 1, but that's not really a big enough spread. IMO,
you'd need something with close to a factor of 10 difference between the
typical nonspam hits and typical spam hits.


Do you have some example ideas for rules, and spam messages that this would
affect?

I ask largely because it's my impression that while implementing this would not
horribly difficult, it also would not be trivial. However implementing support
for it in the perceptron so it can be used in the base ruleset would be down
right complicated. 

It should also be noted that has been suggested numerous times in the past, and
nobody's presented a decent case to convince someone to implement it yet.
That's not to say it's a bad idea, but it's one that clearly needs a reason,
not just a simple "this would be useful".


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