I am the owner of Fundraising-DE. Please close the mailing list, it hasn't been used for ages now (about three years now, if I am right). The fundraiser is not organized through this mailing list anymore.
The way you should close the mailing list is by doing the following: (only listadmins can do)
First, remove the list from the listinfo page display by going to https://lists.wikimedia.org/mailman/admin/fundraising-de/?VARHELP=privacy/subscribing/advertised and setting the value to 'No'. Then to reject all new posts go to https://lists.wikimedia.org/mailman/admin/fundraising-de/?VARHELP=privacy/spam/header_filter_rules and in the first rule box, enter 'From: .*' and select the 'Discard' option. This will now discard all emails with a From header (the preferred way when rejecting all mail in mailman).
If spam is an issue after the above, go to https://lists.wikimedia.org/mailman/admin/fundraising-de/?VARHELP=general/owner and remove all the emails listed there. This will mean no emails will be sent out to people regarding pending requests.
i deleted the list on the server but kept the archives. As mentioned in the request there was no real content since about 2012.
@sodium:/var/lib/mailman/bin# ./rmlist fundraising-de
Not removing archives. Reinvoke with -a to remove them.
Removing list info