list creation ignores DEFAULT_EMAIL_HOST

[Greg Ward]

If I set DEFAULT_EMAIL_HOST in mm_cfg.py, its value is
ignored when creating a new list. It's pretty easy to see
why: MailList.InitVars uses DEFAULT_HOST_NAME. But
the two are only equal as long as mm_cfg.py is not used.

If DEFAULT_HOST_NAME and DEFAULT_EMAIL_HOST
are really supposed to be the same, perhaps
DEFAULT_HOST_NAME should not be set in Defaults.py --
rather, any code that looks at DEFAULT_EMAIL_HOST
should check to see if DEFAULT_HOST_NAME happens to
be defined in mm_cfg, and use it if so. Or something like
that.

I'm happy to supply a patch if someone agrees that this is a
bug.

[http://sourceforge.net/tracker/index.php?func=detail&aid=621597&group_id=103&atid=100103]