The contents of other files may be included in the configuration file. If a line is encountered with a less than sign (<) in column one, the rest of the line is treated as a file name; the file name should always be an absolute and full file path. The file is opened and its contents are spliced into the configuration file at that point. Include files may be nested up to three levels deep. The following imta.cnf file fragment includes the /usr/iplanet/server5/msg-tango/table/internet.rules file.
Any files included in the configuration file must be world-readable just as the configuration file is world-readable.