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by cat199 2444 days ago
all of these are up to the list. various policies

spam: some run filters on the list, some let it through

banning: some lists are moderated where posts go through moderators, some are not, ban tendency is up to the list administrator

archives: some listserve software has built in archives, other people run add-on web applications, others dont archive at all.

see also https://en.wikipedia.org/wiki/List_of_mailing_list_software , etc.