Anywhere in the chainmail configuration file an "include" directive may appear. It has the following syntax:
The filename must be double-quoted and be an absolute file name (starting with /). This directive causes chainmail to read the given file and interpret its content as if it was present in the configuration file instead of the "include" directive. The file being included may contain "include" directive of its own — the inclusion depth is not limited. If the include file cannot be found or read, chainmail issues a warning, but continues processing as if the erroneous "include" directive was not present.