Majordomo is a mailing list manager (MLM) developed by Brent Chapman.
It is written in Perl and works in conjunction with sendmail on UNIX and related operating systems.
The name is derived from Latin "majordomo" meaning "master of the house"; in English, the word refers to a large household's chief servant.
In 1984, LISTSERV was developed to run on IBM VM mainframes, and automated mailing lists on a large scale.
You may charge for enhancements you've made to the Majordomo software, subject to the distribution restrictions listed [in the license].