Rspamd (modern alternative to SpamAssassin)

• Lower power consumption than SpamAssassin, faster, and has a web-based control interface.
• It includes greylisting, IP reputation, and DKIM verification modules.

Well then let’s get started:

Rspamd

Ubuntu 22.04/24.04:

sudo apt update
sudo apt install rspamd

Configuring Rspamd

Rspamd is installed as a service (/etc/rspamd/).

sudo nano /etc/rspamd/local.d/worker-proxy.inc

Check or add :

bind_socket = "127.0.0.1:11332";
milter = yes;
timeout = 120s;
upstream "local" {
default = yes;
self_scan = yes;
}

Integrate Rspamd with Postfix

Edit Postfix configuration:

sudo nano /etc/postfix/main.cf

Search and edit, if they don’t exist add them at the end. if you are using plesk just add at the end or plesk will overwrite them with their default settings.

milter_default_action = accept
milter_protocol = 6
smtpd_milters = inet:127.0.0.1:11332
non_smtpd_milters = inet:127.0.0.1:11332

Now, just restart postfix

sudo systemctl restart postfix

Now your emails will have antispam protection. rspamd already has default settings for filtering emails, but you can modify them to your liking. I recommend researching how to configure rspamd User settings | Rspamd Documentation

Configure rspamd using files and commands on /etc/rspamd/local.d

or we can configure its web interface. It’s only accessible locally, so if you want to access its web interface, you’ll need to connect via SSH and create a tunnel to port 11334.

Web Access to Rspamd

Rspamd has a web interface on port 11334.
Edit:

sudo nano /etc/rspamd/local.d/worker-controller.inc

add and edit:

bind_socket = "127.0.0.1:11334";
password = "create-pass-for-read-only"; # use rspamadm pw for create one
enable_password = "strong-password"; # use rspamadm pw for create one

Can create strong passwors with

rspamadm pw

Now, just restart rspamd

sudo systemctl restart rspamd