Description of problem:

I try to send a mail to atelier-discuss@ml.mageia.org and I received this feedback:

"Your message for list 'atelier-discuss' (attached below) was rejected.
You are not allowed to send this message for the following reason:

 Message distribution in the list is restricted to list subscribers.
If you are subscribed to the list with a different email address, you should
either use that other email address or update your list membership with the
new email address.


For further information, please contact atelier-discuss-request@ml.mageia.org"

When I go on https://ml.mageia.org/l I've this one:

"Server error!

The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there was an error in a CGI script.

If you think this is a server error, please contact the webmaster.
Error 500
ml.mageia.org
Apache/2.2.23 (Mageia/PREFORK-1.mga1)"


How reproducible:
- Send a mail from thunderbird or kmail.
or
- Go on https://ml.mageia.org/l