EDIT: the test period has ended, and the login no longer works.
This test server from News-Service.com allows up to 16 connections and apparently unlimited speed. Currently 375 days of retention and, it seems, excellent completion.
test.news-service.com
port 119
(no username/password)
For anyone thinking "It's useless to me, I already pay for an unlimited account at Giganews" - don't forget that in most newsreaders you can also set up backup servers to fill in missing articles or headers.
Enjoy it while it lasts.
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