django不在testcase上发送电子邮件,但在shell上发送

我有个奇怪的问题。每当我试图从 TestCase ,我无法接收。不过,我在django shell上尝试了同样的方法,它成功地发送了电子邮件。这是我的 测试用例 :

class DefaultEmailTestCase(TestCase):
    def test_send(self):
        msg = EmailMessage(
            "Test Message",
            "This is a test message.",
            to=["foo@bar.com", "foo@baz.com"]
        )
        val = msg.send()
        self.assertEqual(val, 1)

它成功完成,但我没有收到电子邮件。下面是我在Django的壳上做的:

from django.core.mail import EmailMessage

receivers = ["foo@bar.com", "foo@baz.com"]

msg = EmailMessage(
    "Test Message",
    "This is a test message."
    to=receivers
)

msg.send()

我成功地收到了信息。

以下是我的设置顺序(使用虚拟信息):

EMAIL_BACKEND = 'django.core.mail.backends.locmem.EmailBackend'
EMAIL_HOST = "foo.bar.com"
EMAIL_PORT = 465 # This is the port that my email provider uses.
EMAIL_HOST_USER = "foo@bar.com"
EMAIL_HOST_PASSWORD = "123456"
# EMAIL_USE_TLS = True # Django raised an error saying that I cannot use both TLS and SSL. So I commented it out.
EMAIL_USE_SSL = True
DEFAULT_FROM_EMAIL = "Bar Testing Message <foo@bar.com>"

我也用过 django.core.mail.backends.smtp.EmailBackend 作为 EMAIL_BACKEND 但运气不好。

测试用例和django shell都使用我的开发设置,所以它们是相同的。我不知道为什么这样不行。

提前谢谢。

环境

• Python 3.6
• Django 2.0.4