Postfix CIDR blocklist update script

get-spam-blocklist

#!/usr/bin/env node
var http = require('http');
http.get({
	hostname: 'www.spamhaus.org',
	port: 80,
	path: '/drop/drop.lasso'
}, function (res) {
	if (res.statusCode !== 200) {
		console.error('Failed to download http://www.spamhaus.org/drop/drop.lasso');
		process.exit(1);
	}

	var buffer = '';

	res.setEncoding('utf8');
	res.on('data', function (chunk) {
		buffer += chunk.toString();
	});

	res.on('end', function () {
		var list = buffer.trim().split('\n').map(function (line) {
			if (line.indexOf(';') <= 0) return;

			var s = line.split(';')[0].trim();
			if (s) {
				return s + ' REJECT';
			}
		}).filter(function (line) { return line; }).join('\n');

		console.log(list);
	});
});

update-spam-blocklist

#!/bin/bash
get-spam-blocklist > /etc/postfix/client.cidr
postfix reload

Create the above get-spam-blocklist and update-spam-blocklist files in your /usr/local/bin directory.

Then add a cron job:

sudo ln -s /usr/local/bin/update-spam-blocklist /etc/cron.daily/