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Previous: 7.3 Predefined Macros Chapter 7
Next: 8. Addresses and Rules

7.4 Things to Try

  • Macro names that begin with uppercase letters are for your use. Names that begin with lowercase letters are reserved for sendmail 's use. Twenty-seven special characters are also reserved by sendmail for use as operators. What happens if you try to define a macro whose name is another character, such as a tab or an underscore?

  • What happens if you try to define a macro whose name is an operator?

  • Using the -d35.9 command-line switch, determine what happens if you define two macros, each with the same name.

  • Any sendmail.cf command may be continued and extended by beginning the next line with a tab or a space. Using the -d35.9 command-line switch, determine the effect of continuing a macro definition. For example,


  • The text value of a macro must immediately follow the name of that macro, with no intervening space. Can the text value contain arbitrary spaces or tabs?

  • Using grep (1), find all the D commands in your site's actual sendmail.cf file. If you find any that begin with a lowercase letter and that you haven't seen before, try looking them up in Chapter 31, Defined Macros .