[Mailman-Users] Server changing

I put mailing lists to a new server and changed in /etc/mailman/mm_cfg.py DEFAULT_EMAIL_HOST and DEFAULT_URL_HOST.

But the List Administration points under 'Go to list archives' to the old server.

The posted mails contain in List-Unsubscribe, List-Archive and List-Subscribe the old server address.

What should I do?

Egon