As we announced it already (see https://lists.CentOS.org/pipermail/CentOS-announce/2015-August/021341.html)
, the CentOS Project infra tream decided to implement/enforce TLS on a maximum of websites/web services.

We have so implemented it for the mailman website :
https://lists.CentOS.org

Should you encounter an issue, feel free to either report it on https://bugs.CentOS.org, or in #CentOS-devel on irc.freenode.net.

on behalf of the Infra team,
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