Install Pyzor

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Install Pyzor[edit]

Jake Vickers <> September 19, 2006 Scott Hughes - Updated - June 9, 2009

"Pyzor is a collaborative, networked system to detect and block spam using identifying digests of messages."
(from the Pyzor website:

Installing Pyzor is rather easy. You need to have python installed first. Here are the steps to install from source:

Download pyzor from Sourceforge (


Unpack the package:

tar xjvf pyzor-0.5.0.tar.bz2

Move into the dir:

cd pyzor-0.5.0

Download patches from

patch -p0 -b -Vt < patch-pyzor-debian-mbox
patch -p0 -b -Vt < patch-pyzor-handle_unknown_encodings
patch -p0 -b -Vt < patch-pyzor-unknowntype

Run the setup process:

python build
python install
pyzor discover

The 'pyzor discover' command tells pyzor to contact home and find the latest list of servers to use. I add this to a cron to be run nightly:

17 2 * * * pyzor discover

Make sure that pyzor is enabled in your /etc/mail/spamassassin/v310.pre file:

# Pyzor - perform Pyzor message checks.
loadplugin Mail::SpamAssassin::Plugin::Pyzor

And then make sure that spamassassin is going to use Pyzor as a check:

echo "use_pyzor 1" >> /etc/mail/spamassassin/

Now check to make sure it shows. Note: You will frequently show a timeout on Pyzor. This is normal - the server is very busy.

spamassassin -D --lint

And that's it.

Some more tips for Pyzor:

The default server will timeout 50% of the time. Google to find another server to use - most do NOT allow high volume servers to check against theirs. If you find some that DO allow this, please post them here for the rest of us!

Known good Pyzor servers:
IP:Port Last Verified Where Found 11/20/2006
<new ip:port> <new date> <new URL>

User Tips & Tricks[edit]