|Updated:||9 April 2015|
p0f is a passive OS finger-printing tool that analyses the network traffic sent by a remote host that is performing some network task, such as connecting to the mail server, for signature traits that can identify the remote device in some manner.
This milterr provides an interface between sendmail and p0f running as a daemon. Currently, it only adds to each message a X-milter-p0f-Report header containing the p0f information. This header can be subsequently used by other milters or tools such as milter-cli or milter-spamc with SpamAssassin, or an end user's mail client message filters.