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Remember to keep up-to-date with regular security reviews. Schedule regular checks of your system for root kits. Ensure your users have secure passwords, and regularly check the integrity and security of your users passwords. For a consistent approach to some base-level security, run a hardening script such as Bastille Linux across your systems. Use NMAP to scan your systems to confirm that you know and understand all the services and ports that are active on your systems. Use a tool such as Nessus or SARA to audit your applications and systems for known vulnerabilities. If you are attempting to investigate a potential penetration, keep detailed records both for your own purposes and in case auditors or law enforcement require evidence of the penetration. If you recover a system, you should follow the basic rules I have articulated.

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Keep your mail server software up-to-date by regularly checking its site (http:// www.sendmail.org for Sendmail and http://www.postfix.org for Postfix). You should also consider subscribing to any announcement mailing lists available for your mail server. Keep informed about threats to your mail infrastructure via mailing lists such as BugTraq and via Web sites such as CERT (http://www.cert.org). I also detail a variety of other sites and mailing lists in 1. Ensure you have secured your mail server from penetration and DoS attacks by configuring your mail server securely, as described in this chapter. You should also ensure your firewall rules are strong and secure as described in 2. Keep on top of new trends in spammer tactics and antispam techniques. You can do this at sites such as http://spam.abuse.net/ and http://www.arachnoid.com/lutusp/ antispam.html.

Task.Wait() and Task.WaitAll()

Regularly tweak your antispam rules and checks to ensure they are doing the job. Ask your users to forward spam that slips through your filters to a central Spam mailbox, and use this spam to tweak your antispam rules. Regularly check the efficiency of any RBLs you have defined against other available RBLs. Ensure your antivirus software is up-to-date and that your virus definitions are updated regularly.

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Where possible, you should try to always use TLS encryption for your mail transmission. Handle your TLS keys and passphrases with the same level of security you would treat other system passwords. If you need relaying, use SMTP AUTH with Cyrus SASL with authenticate your users and ensure only legitimate users are allowed to relay mail through your MTA. Always try to use SMTP AUTH in conjunction with TLS encryption. Keep your OpenSSL and Cyrus SASL packages up-to-date to ensure you address any potential vulnerabilities and exploits.

The Task.Wait() and Task.WaitAll() methods allow you to pause the flow of execution until the tasks you specify have completed their work. The following listing shows an example of using the Wait() method to ensure that task1 has completed and the WaitAll() method to ensure that task2, task3, and task4 have finished before exiting the application: Task Task Task Task task1 task2 task3 task4 = = = = Task.Factory.StartNew(() => Console.WriteLine("hello task 1")); new Task(() => Console.WriteLine("hello task 2")); Task.Factory.StartNew(() => Console.WriteLine("hello task 3")); Task.Factory.StartNew(() => Console.WriteLine("hello task 4"));

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