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[Dan Mick]

> Defaults.py has the trailing /, but it is also defined in mm_cfg.py...that
> reference to DEFAULT_URL was missing the /.

You probably realize it by now, but it bears repeating: any "configuration variable"
should first be searched for in mm_cfg.py, and then, if not present, in Defaults.py;
if it needs to change from its default value, put the value in mm_cfg.py; don't
ever edit Defaults.py.  (Well, hardly ever, as G&S would say.)

Defaults is read, and then mm_cfg, and the new settings in mm_cfg are the "final"
settings.  Defaults is intended to be "Mailman version defaults", and mm_cfg
is "site defaults".  Other role splits are possible, of course, but the lesson
is that mm_cfg holds sway, so be sure to look and edit there in all but the most
exceptional cases.