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Chapter 3, "configuring qmail: the basics," covered the fundamentals of qmail configuration: the control files, relay control, aliases, virtual domains, and the qmail-users mechanism.
This chapter will explore more advanced configuration topics.
This chapter covers advanced qmail configuration:
First, we'll show how to configure qmail for one of several typical configurations such as backup mail exchanger (MX), null client, or smart host.
Next, we'll look at some of the issues involved with migrating an existing Sendmail-based mail system to qmail: .forward vs. .qmail, mailbox format and location, and aliases.
We'll also learn about source-code modifications, also known as patches: how to install them and some of the more frequently used patches.
Then, we'll look at two additional protocols that qmail supports: Quick Mail Transfer Protocol (QMTP) and Quick Mail Queueing Protocol (QMQP). You'll learn what they're used for and how to install and configure them.
Next, we'll examine ways to secure Simple Mail Transfer Protocol (SMTP), which normally exposes the content of messages over the network.
Finally, we'll discuss various techniques for improving your qmail system's performance.
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