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The following link redirects to bing:
https://listes.renater.fr/sympa?referer=https://www.bing.com&passwd=&previous_action=&action=login&action_login=&previous_list=&list=&email=
It also works in 6.2.16. We have no newer sympa to test with.
It seems to me maybe this is a bug in a perl dependency? I couldn't find "referer" directly in sympa's source code during a (very) cursory grep.