Courtesy of Kyle! Pulls all ISO country codes except for the US and populates iptables with ALL ranges in those countries automatically. Setup a cron job (/etc/crontab) to run every week: @weekly /usr/local/bin/isoCodeBlockIptables.sh Put the isoCodeBlockIptables.sh in /usr/local/bin/ and chmod +x it. The script first backups up the existing config to /backup/iptables-last.txt first. After it [...]
From http://wiki.apache.org/spamassassin/VBounceRuleset The “Virus Bounce Ruleset” is a SpamAssassin ruleset to catch “backscatter”. Backscatter is mail you didn’t ask to receive, generated by legitimate, non-spam-sending systems in response to spam. Here are some examples, courtesy of Al Iverson: Misdirected “undeliverable email” bounce messages from spam runs, from mail servers who “accept then bounce” instead of [...]
This article will show you how to replicate most of the functionality of a Barracuda Spam Firewall. If you work at a company that has an IT budget, then by all means I recommend purchasing one of these devices. If your company has no budget or if you’re the adventurous learn it on your own [...]
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