We have moved our mailing lists hosting to python.org, the source-forge lists should no longer be used.
The new lists are
matplotlib-devel@…48… https://mail.python.org/mailman/listinfo/matplotlib-devel
matplotlib-users@…48… https://mail.python.org/mailman/listinfo/matplotlib-users
matplotlib-announce@…48… https://mail.python.org/mailman/listinfo/matplotlib-announce
To unsubscribe from the current lists see http://www.list.org/mailman-member/node14.html
The auto-responders on the source-forge lists have been set to be more aggressive.
Tom