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The previous chapter used some fragments of a simple Exim configuration file to show how it goes about delivering a message. Later chapters go into more detail about the various options that can be used to set up configurations that can handle many different circumstances. However, if you have just installed Exim, or if you have inherited responsibility for an Exim system from somebody else, you most likely want to know a little bit about the basic operational aspects. This chapter is an introductory overview; the features that are described reappear later in more detailed discussions, and Chapter 21, covers Exim administration in more detail.