On Dec 15, 2014, at 10:20 AM, Herbert Eppel <h...@hetranslations.co.uk> wrote:
> In view of the fact that some of my domains are increasingly inundated with 
> spam, I would like to reduce the SpamAssassin score from the default value of 
> 5 to a lower value, in order to make SpamAssassin more 'aggressive'

This is not the way to go, though it seems to make sense. The rulesets are 
designed around the idea that pushing past a 5.0 indicates a strong possibility 
that the message is spam and that a sore of 4.5 is not. If you drop the score 
to 4.5, you are not making SA more aggressive, you are intentionally marking 
message that SA says are not spam as spam.

A better way is to adjust scores. Carefully.

The best way is to train babes, but train it well. If your host doesn’t allow 
this, maybe you can find a host that does?

Also, what is your server doing BEFORE receiving the message to block spam? 
Most mail providers with cPanel seem to do either nothing or nearly nothing.

Good filters and postscreen (or postscreen-like) before SMTP transaction will 
do *far* more to alleviate your spam problem.

-- 
you cannot code around infinite implementations of OCD -John C Welch

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