Wikipedia
The National Academic Mailing List Service, known as JiscMail, is the UK's biggest educational and research email discussion list community. JiscMail is part of Jisc. JiscMail hosts over 9000 educational and research email mailing lists and has over 1,500,000 unique subscribers (correct as of Aug 2015). JiscMail uses LISTSERV mailing list software.
JiscMail helps groups of individuals to communicate & discuss education/research interests using email discussion lists. JiscMail Helpline are the team who provide information, advice, support and help to users of the service, from setting up new lists, to helping customers find lists, join lists, update their details.
JiscMail became the National Mailing List Service as the successor to a previous service, Mailbase, in November 2000.