Pyzor

Pyzor is a collaborative, networked system to detect and block spam using digests of messages.

Using Pyzor client a short digest is generated that is likely to uniquely identify the email message. This digest is then sent to a Pyzor server to:

• check the number of times it has been reported as spam or whitelisted as not-spam

• report the message as spam

• whitelist the message as not-spam

Since the entire system is released under the GPL, people are free to host their own independent servers.

There is, however, a well-maintained and actively used public server available (courtesy of SpamExperts) at:

public.pyzor.org:24441

Installation

Pyzor is installed from the Ubuntu software repository:

$ sudo apt install pyzor

Pyzor Home Directory

Since we will run the Pyzor service by the _rspamd user-profile, we have to create the Pyzor home directory:

$ sudo -u _rspamd mkdir /var/lib/rspamd/.pyzor

Systemd Configuration

Socket File

Create a new Systemd socket file /etc/systemd/systemd/pyzor.socket:

[Unit]
Description=Pyzor socket

[Socket]
ListenStream=127.0.0.1:5953
Accept=yes

[Install]
WantedBy=sockets.target

Service File

Create a new Systemd service file /etc/systemd/system/razor@.service:

[Unit]
Description=Pyzor Socket Service
Requires=pyzor.socket

[Service]
Type=simple
ExecStart=-/usr/bin/pyzor check
StandardInput=socket
StandardError=journal
TimeoutStopSec=10

User=_rspamd
NoNewPrivileges=true
PrivateDevices=true
PrivateTmp=true
PrivateUsers=true
ProtectControlGroups=true
ProtectHome=true
ProtectKernelModules=true
ProtectKernelTunables=true
ProtectSystem=strict

[Install]
WantedBy=multi-user.target

Reload and Start

Reload the Systemd configuration and start the socket:

$ sudo systemctl daemon-reload
$ sudo systemctl enable pyzor.socket
$ sudo systemctl start pyzor.socket

References

See Rspamd Spam Filter for the Integration with our spam filter.