Same is happening on geotools-gt2-users and geotools-devel, I cannot post to them even if I'm subscribed and getting back the above error.
The same has been happening on the GeoServer lists, I think it's a SPAM detection software... if it is, it's currently badly configured, a few links to code repositories in order to discuss development related issues and the mail gets rejected.
GeoServer mailing list deliver with days of delay
Hi, I can confirm the geotools and geoserver mailing lists are in the same state,...
List index out of range showing tips