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Linux, Cloud & Windows tutorials for beginners : How to configure Postfix SMTP relay office365 on Ubuntu 16.04
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![1.3. The Role of Postfix - Postfix: The Definitive Guide [Book]](https://www.oreilly.com/api/v2/epubs/0596002122/files/httpatomoreillycomsourceoreillyimages72540.png "1.3. The Role of Postfix - Postfix: The Definitive Guide [Book]")
1.3. The Role of Postfix - Postfix: The Definitive Guide [Book]
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