John,

> checking the p0f website last developments date back to 2006.
> No visible  activity ever since.

Yes. That's a pitty.

> Does it make sense today to use p0f to find out about the clients that 
> connect to port 25? Or are p0f signatures completely outdated?

Depends what you use them for. I mostly agree with Giampaolo.

It still distinguishes Windows from Unix rather well. In this role
it is still of help when a SA Botnet plugin (also outdated) is in use,
as the p0f can save Unix/Linux hosts from Botnet false positives.

In our part of the world (non-US) its TTL distance information is
a bit of a help, as we rarely receive spam from hosts close to us
(being in an academic network, connected to the rest of the internet
via GEANT).

  Mark

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