The notoriously complex config syntax of sendmail has also been proven to be Turing complete: http://okmij.org/ftp/Computation/sendmail-as-turing-machine.txt ht

The notoriously complex config syntax of sendmail has also been proven to be Turing complete: http://okmij.org/ftp/Computation/sendmail-as-turing-machine.txt http://okmij.org/ftp/Computation/sendmail-as-turing-machine....