[Fixed]-Django not sending error emails – how can I debug?

• For the debugging part of the question

  @zopieux commented:

  First, check that mails are being sent. Set:

  EMAIL_HOST = 'localhost'
  EMAIL_PORT = 1025
  EMAIL_USE_TLS = False
  EMAIL_USE_SSL = False
  

  Then run a dummy SMTP server:

  python -m smtpd -n -c DebuggingServer localhost:1025

  If this works, you can revert the changes and manually send an email as described in this relevant question:

  from django.core.mail import EmailMessage
  email = EmailMessage('Hello', 'World', to=['user@gmail.com'])
  email.send()
  

• For the feature of using Google as SMTP server:

  The most popular -and updated- answer of the question states that Google does not support anymore this feature (2016) and that you should try to find another SMTP server.

I have posted my working logging configuration for reference.