Re: [Asrg] News Article - Microsoft and spam

[Vernon Schryver <vjs@calcite.rhyolite.com>]

> From: Walter Dnes <waltdnes@waltdnes.org>

> > Of the 34,740 spam in my 39 day rolling log that were not relay
> > probes, 15,025 or 43% had sender domains from among the 784 domains
> > listed in http://www.rhyolite.com/anti-spam/freemail.html
>
>   Do you have separate spam stats for where email claiming to be from
> service X actually is from service X, versus email claiming to be from
> service X actually is from service Y? 

I don't have "stats".  Instead I wrote a script that ground through
what were at the time 34,740 milter/DCC log files.  It took from each
log file the sender domain as it was handed to the sendmail.cf
Local_check_mail rule and then canonicalized.  Then it `grep`d through
the flat file that generates part of my access_DB.

> ...
>   This is less draconian than blindly rejecting based on envelope
> sender.  It still catches spammers, but has a lot fewer false positives.

For my particular situation, the false positive rate of my blacklist
of free provides is less than 0.05% of all mail sent my direction
and less than 0.5% of legitimate mail.  Your results may vary.


Vernon Schryver    vjs@rhyolite.com

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