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Edit File: mailman.conf
<IfModule mod_headers.c> <Directory "/usr/local/cpanel/3rdparty/mailman/archives"> # If a Content-Type has not already been set by other means, apply the default of application/octet-stream so the file will be treated as a download. Header add Content-Type application/octet-stream "expr=-z %{resp:Content-Type}" # Prevent the browser from attempting to guess the Content-Type. Header set X-Content-Type-Options "nosniff" </Directory> </IfModule>