Hello Marcio,

Tuesday, December 2, 2003, 3:12:04 AM, you wrote:

>> header   RM_hr_VirtuaComBr  Received =~ /virtua\.com\.br/
>> describe RM_hr_VirtuaComBr  Spam passed through relay known to be used by spammers
>> score    RM_hr_VirtuaComBr  1.690  # 69s/0h of 63143 corpus

MM> You may want to add dsl.telesp.net.br here. It is a bigger spam
MM> source than virtua. BEWARE: There is ham coming from there also, but
MM> mostly spam.

Thanks for the tip/recommendation.

In the 2.60 distribution I find
> header   FORGED_TELESP_RCVD  Received =~ /\.(?!br).. 
> \(\d+-\d+-\d+-\d+\.dsl\.telesp\.net\.br /
> describe FORGED_TELESP_RCVD  Contains forged hostname for a DSL IP in Brazil
> score    FORGED_TELESP_RCVD  2.900 2.800 2.800 2.700

Possibly because of that latter rule, I've never seen the need to
generate a Received rule for telesp.net.br

Testing FORGED_TELESP_RCVD against the simpler Received rule for all of
dsl.telesp.net.br with my corpus, I find:
> RM_hr_VirtuaComBr  -- 69s/0h of 63137 corpus (my rule above)
> FORGED_TELESP_RCVD -- 1s/0h of 63137 corpus (2.60 distribution)
> RM_hr_telesp       -- 281s/0h of 63137 corpus

So it looks like your recommendation has some value.
The rule I tested was:
> header   RM_hr_telesp  Received =~ /dsl\.telesp\.net\.br/
> describe RM_hr_telesp  Spam passed through relay known to be used by spammers
> score    RM_hr_telesp  1.690  # 69s/0h of 63143 corpus

Can it be improved?

Bob Menschel




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