'Invalid address when sending mail via Django

I am trying to send mail via Django, but have an error: (501, b'5.1.7 Invalid address', '"emea\\\\sss1ss1"') My EMAIL_HOST_USER = r'emea\xss1ss1'. As you can see my user consist \x so I am using r''. How to fix it, the real EMAIL_settings are correct.

my view.py

def home(request):
    subject  = 'Test mailing'
    message = 'Hello world!!!'
    email_from = settings.EMAIL_HOST_USER
    recipient_list = ['[email protected]']
    send_mail(subject,message,email_from,recipient_list)

    return HttpResponse('Test mailing')


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