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Sendmail, 3rd Edition by Bryan Costales

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Class Configuration Commands

The five forms for the class configuration command are the following:

CX list         values from configuration file 
CX $=Y          copy values from another class (V8.10 and above) 
FX /file        values from a disk file 
FX |program     values via another program 
FX key@database values from a database map (V8.12 and above)

The class configuration command starts with either the letter C or F, which must begin a line. The C says values will be assigned as a part of the configuration command. The F says values will be assigned from an external file, program, or database map.

The C or F is immediately followed (with no intervening whitespace) by the name of the class (the X in the preceding commands). A class name is any single ASCII character or, beginning with V8.7 sendmail, a multicharacter name enclosed in curly braces:

CX list             all versions 
C{LongName} list    beginning with V8.7

See Section 21.4.2 for a full discussion of how to use multicharacter names.

Note that classes are separate from macros, so they can both use the same letter or name with no conflict.

The sendmail program reserves the lowercase letters for its own use as internally defined class names. All uppercase letters and all names that begin with uppercase letters are available for your use.

The C Class Command

The C form of the class command causes values to be assigned from within the configuration file. In general, the C class command looks like this:

CX list            values from configuration file 
C{XX} list ...

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