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《3.1. Extracting Configuration Data》
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Build an Email Application With Ruby
教程列表：
1.1. Introduction
1.2. Bootstrap the Project
1.3. The Net--IMAP Library
2.1. Fetching Emails
2.2. Listing Folders With Emails
2.3. Creating Our First Integrated Task
2.4. Sending Email
2.5. Storing Email
2.6. Reply to an Email
3.1. Extracting Configuration Data
3.2. Set Up a Bootstrap Task
4.1. Publishing the Gem
4.2. Conclusion