While working on the tracker for python.org, I found I
had to override some permission checking for the
mailgw. To do this without copy/pasting the full
handle_message, I factored out a hasPermissions method
which I could override in interfaces.mailgw. I know
more needs to be done (with the new permissions system
et al), but I would like to see this in Roundup 0.7.7
so I don't have to keep patching Roundup on python.org
every time I upgrade.