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Sendmail, 3rd Edition by Bryan Costales

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Chapter 8. Test Rule Sets with -bt

The sendmail program offers a mode of operation (called rule-testing mode) that allows you to observe the flow of addresses through rule sets. The -bt command-line switch causes sendmail to run in rule-testing mode. This mode is interactive. You enter rule set numbers or names, addresses, and other commands, and sendmail processes them and prints the results. The -bt switch’s chief use is in testing changes in the configuration file. It is also useful for learning how rules and rule sets work.

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