This value may be either the name of your news server, or optionally of the format name:port, where port is a port number. The news server is not part of Mailman proper. You have to already have access to an NNTP server, and that NNTP server must recognize the machine this mailing list runs on as a machine capable of reading and posting news.
Balio hau zure berri taldeen zerbitzaria, edo aukeran izena:ataka formatuan, ataka zenbaki bat dela izan behar du. Berri posta zerbitzaria ez da Mailmanen zati bat. Zuk aurretik NNTP zerbitzari batera sarrea eduki behar dizu eta NNTP zerbitzariak postak irakurri eda bidali ditzazken makina bat bezala ezagutu behar du.