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From Christian Laußat <>
Subject Is p0f (passive OS detection) still usefull?
Date Fri, 04 Jul 2014 12:26:43 GMT
There is an old p0f plugin on
p0f didn't seem maintained since 2006, but there is a new rewritten 
version on (with a different API).

I have written a plugin to use this new version of p0f (

) and found in my own statistics that almost all mails comming from 
Windows are spam (probably botnet infected PCs). I don't want to judge 
an email sender on the OS he's using, but I think it's worth adding a 
few spam score points for Windows.

Do you think passive OS detection is still usefull today?

Christian Laußat

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