Understanding cutoff-dsn

Michael Scheidell michael.scheidell at secnap.com
Fri Aug 26 14:57:54 CEST 2011

On 8/26/11 4:57 AM, Lars Jørgensen wrote:
> $sa_dsn_cutoff_level = 6.3;
> $sa_crediblefrom_dsn_cutoff_level = 18;
> I understand the first one, but what does the second one do? About 
> half my daily ndrs have scores higher than 6.3, and I suspect that is 
> because of the "crediblefrom".
if a spam scores < 6.3, the sender gets a 'bounce' (you might be a 
spammer if....)
if it also has valid spf or dkim, and its under 18, the sender also gets 
a bounce.

so, forged spammers < 6.3 will create backscatter.
spammers who spam from valid accounts will get bounces till it scores 18.

Michael Scheidell, CTO
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