Whitelisting logged in user

Rabellino Sergio rabellino at DI.UNITO.IT
Wed Aug 24 15:01:40 IST 2005

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Ugo Bellavance wrote:

>Nigel kendrick wrote:
>>One of our users is currently on a dial-up link and it looks like the
>>dial-up IP block has been blacklisted so their mail is being deleted due to
>>"Spam Lists To Be Spam = 3". I get the feeling a ruleset that ups the
>>threshold to, say, 5 would be a workaround, but it would not be watertight.
>>Users have to authenticate before sending - can this be worked into a
>>ruleset? I'm not sure where to start with this one so any pointers would be
>>Nigel Kendrick
>Maybe implementing SMTP-AUTH at mta level?
Using in sendmail the TSL+AUTH, you get into your headers a string like this

 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO userCertificateDN= DipinfoAuthUser=YOURUSER );

Then I've inserted into spamassassin this rule:
header   AUTHENTICATEDUSER Received =~ /(.*)DipinfoAuthUser=\w(.*)/
describe AUTHENTICATEDUSER Email Sender Auth by MY MTA

Where DipinfoAuthUser was choosed by me as a search token.

Now, the problem is that (As far as I know) the blacklists wins against 
a SA score, even if negative score, so now i've disabled the blacklist 
from MS.
There's a way to understand the behaviour if blacklist and SA checks are 
in contrast by themself ???


Dott. Mag. Sergio Rabellino 

 Technical Staff
 Department of Computer Science
 University of Torino (Italy)

Tel. +39-0116706701
Fax. +39-011751603

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