Perhaps a message to the effect of "These messages are specifically disowned by the groups to which they are posted, have historically been riddled with blatant errors, and are assumed to continue in the same quality." should be posted as a follow-up to each of these messages by XL in order to avoid having to spend the time to find the inaccuracies in each one individually.
Considering the response so far, a list of frequent posters and not-so-frequent posters who will vouch for the accuracy of the disclaimer might even be added. Daniel Fackrell -- http://mail.python.org/mailman/listinfo/python-list
