The (RFC2369) e-mail headers for this mailing list (curl-library) include:
List-Archive: <http://lists.haxx.se/pipermail/curl-library/>
This URL format is standard for MailMan V2 mailing lists, but results in
a 404 for this one.
It appears that the value of List-Archive should be
https://curl.se/mail/list.cgi?list=curl-library
You may also wish to provide a redirect from the pipermail URL to the
current archive since all archived/saved mail to the list contains the
erroneous (old) URL for the archive.
--
Timothe Litt
ACM Distinguished Engineer
--------------------------
This communication may not represent the ACM or my employer's views,
if any, on the matters discussed.
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