As you will know from recent posts, CentOS is separating from cAos to become an independent project. As part of that change we are implementing new mailing lists.
This new mailing list is now known as centos@centos.org and you have been subscribed to it if you were subscribed to centos@caosity.org.
Due to the large number of people subscribed it has not been possible to retain options etc across to the new list, so if you only want to receive digests or need to change any other options then you will need to login to change them.
You can find out the password assigned to you by having it emailled to you from :-
http://lists.centos.org/mailman/options/centos
The archive of posts has been transferred across to the new list manager.
Regards Lance