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,
D{FOO}something tab somethingmore
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.