Thanks for the mail address, but there should be some visible wiki page containing this address:
http://wiki.maemo.org/Special:Search?search=techstaff, or it should be mentioned here: http://extras-cauldron.garage.maemo.org/HOWTO.html.

Still, I think there should be a way for the uploader to remove a package automatically, e.g. by "dput package-version.revoke" or something like that, or at least a way to look at the entire build result before it is queued for inclusion to extras-devel.