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This chapter covers the following:
First, we'll show how to verify that the qmail processes that should be running are actually running.
Next, we'll describe how to locate and interpret the log files created by qmail and the support processes.
Then, we'll also describe how to read message headers and extract diagnostic information from them.
Next, we'll directly test the qmail SMTP service.
Finally, we'll look at several typical problem scenarios and provide step-by-step procedures for identifying their causes.
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