Mailman is a program that automates the management of mailing lists. The FreeBSD Project uses it to run 17 general lists, 45 technical lists and 6 limited lists. It is also used for many mailing lists set up and used by other people and projects in the FreeBSD community. General lists are lists for the general public, technical lists are mainly for the development of specific areas of interest, and closed lists are for internal communication not intended for the general public. The majority of all the communication in the project goes through these 68 lists [FreeBSD, 2003A, Appendix C].
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