default-domain pref doesn't work?

[Doug Claar]

The default-domain pref got copied over from my netscape 4.79 prefs.js, but
when I compose
an email message, it isn't used. This is a real pain. I'm using netscape
6.2.1 on windows. If
this is fixed in mozilla, let me know!
user_pref("mail.identity.defaultdomain", "foo.bah.com");

Thanks,
==Doug Claar