Qmail was developed in 1995, but first introduced for public and free use in 1998. Qmail is written in Unix, in the public domain and therefore free to use.
To disable qmail, you can stop the qmail service by running the command svc -d /service/qmail if you're using a service manager like daemontools. Alternatively, you can remove the executable permissions for the qmail binaries by using chmod -x /var/qmail/bin/qmail-*. Lastly, you may also want to prevent it from starting on boot by modifying your system's service configuration.
The first airplane was introduced about 1897.
it was introduced in 1923
Cattle were first introduced with the First Fleet in January 1788.
The first camcorder was introduced around 1982 by JVC.
He is introduced in the first page of Stave one.
The factory act was first introduced in 1833.
It was first introduced in 1987
The world's first escalator was introduced on Coney Island
The Trailblazer SS was first introduced in 2006.
Shampoo was first introduced around the 1930's.
The first tanks were introduced on to the battlefield by the British in the First World War.