Compile-Time Macro Reference
In this section, we present each compile-time macro (or group of them) in alphabetical order. There are so many to choose from that you will probably be better off first scanning Table 3-2 on page 105 for any that seem interesting, then going to that particular section for a more detailed look.
As you learn more about sendmail, you might find that a particular option or feature might require that one or more of these compile-time macros be turned on or off. You are encouraged to return to this reference section to study each such compile-time macro before redefining it and rebuilding sendmail.
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