Have a good password! Use bug-free e-mail software, and update your software if there is a known bug on it. Do not use web-based e-mails for too important messages! Protect your IP from others! Use Remailers if needed. Encrypt your messages or data if it has important information. Have a good Firewall! Anti-Virus Programs are must! Update their virus definitions regularly. Follow news, articles about computer security. Do not accept (download) any files from unknown sources. Do not open any e-mail messages if you do not know where it is from. Never give your real name to the directories. Have a different address on the directories than where you live. Create a virtual identity. Check your system regularly for known exploits. Report attackers, spammers, abusers, floode