Our legacy mailinglists on lists.typo3.org are not actively used anymore. Due to increased spam, we decline to accept new mails sent to them. As of now, moderation is enabled an all public lists and we will not allow general communication messages anymore. In the course if this change, we also disabled NNTP news access to the mailinglists alltogether.
This is not expected to cause any harm, as the lists where not in active use anymore. Nevertheless, please approach us if you still need to communicate through such a list to find a decent replacement and plan the migration.