It turns out that the e-mail comments were legitimate. The reason the
tests were passing was because the specific users now had e-mail
addresses, but this not the default case.
bucket.set_acl('private')
+# This test will fail on DH Objects. DHO allows multiple users with one account, which
+# would violate the uniqueness requirement of a user's email. As such, DHO users are
+# created without an email.
+@attr('fails_on_dho')
def test_bucket_acl_grant_email():
bucket = get_new_bucket()
# add alt user