[Answered ]-Update email bcc recipient in email backend

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This is documented behaviour as far as tests are concerned:

Django’s test runner automatically redirects all Django-sent email to a dummy outbox. This lets you test every aspect of sending email – from the number of messages sent to the contents of each message – without actually sending the messages.

The test runner accomplishes this by transparently replacing the normal email backend with a testing backend.

So, your custom backend is never used in your test, which is why it fails. I think the simplest way to address this is to write your test differently, to directly call the send_messages() method on your class, e.g.:

msg = EmailMultiAlternatives(
    self.subject, self.text_content, "test@sender.de", ["test@recipient.de"])
# Note, you may have to mock out some behaviour of the backend to 
# ensure it doesn't actually send an email.
BCCEmailBackend().send_messages([msg])
# This should pass now
self.assertListEqual(msg.bcc, ["should_be_send@bcc.de"], "Default bcc should be set")
👤solarissmoke

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