Subscribing to security bulletin / typo3-announce mailing list not possible

Was did I do?

• Read the security team recommendation "How to stay informed about security updates" (https://typo3.org/community/teams/security)
• Open the link to the typo3-announce mailing list (http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce)
• Enter an E-Mail address and hit the subscribe button

What did I expect?

• The given e-mail is added to the mailinglist

What happened instead?

• The form redirects to a dead domain -> http://lists.netfielders.de/de/ does not exist anymore

Additional information:

• See https://forge.typo3.org/issues/21318 - seems like links to the service have been fixed in the TYPO3 core but not in the service itself