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Pyzor (from

Used to check message signatures against the Pyzor collaborative filtering network. Pyzor was initially "a Python implementation of Razor", but now also uses its own (free) server architecture and is "based upon a new, lighter, more language-independent protocol."

Pyzor requires at least Python 2.2.1 which can be found at .

To install Pyzor, download the latest revision from and perform the following steps:

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        tar xvfj pyzor-*.tar.bz2
        cd pyzor-*
        python build
        python install

For a single user installation, change the last line to

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        python install --home=$HOME

Note that your system might install the modules and scripts with non-world-readable permissions. Correct this with a command such as:

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        chmod -R a+rX /usr/share/doc/pyzor \
                /usr/lib/python2.2/site-packages/pyzor \
                /usr/bin/pyzor /usr/bin/pyzord

Read the INSTALL document if you want to setup your own Pyzor server and signature store. Otherwise, you can just use the public servers.

Note that MIMEDefang users may need to set the 'pyzor_path' configuration setting, since MIMEDefang does not set a PATH by default.

More info is at UsingPyzor.