zulip mailgun: 5.7.0 Mailgun is not loving your login or password

Question

I have tried to set up a Zulip server. For now it works but I can not invite anbybody, actually, the smtp server doesn't work. I use mailgun, here is its configuration:

then for my Zulip configuration, I set up:

• /etc/zulip/setting.py

EMAIL_HOST = 'smtp.mailgun.org' EMAIL_HOST_USER = '[email protected]*****'

MAIL_USERNAME = '[email protected]******' MAIL_PASSWORD = 'Az******' SECURITY_EMAIL_SENDER = '[email protected]******'

EMAIL_USE_TLS = True EMAIL_PORT = 587

• /etc/zulip/zulip-secrets.conf

  [secrets] zulip_org_id = 9724f205-ed93-4******** mail_password = 12****** postgres_password = ******* email_password = cw4DKsfuHnJ********* (password for my account [email protected]*****)

Even though, when I try the command: /home/zulip/deployments/current/manage.py send_test_email [email protected] I get the error:

  File "/usr/lib/python3.5/smtplib.py", line 720, in login
    initial_response_ok=initial_response_ok)
  File "/usr/lib/python3.5/smtplib.py", line 641, in auth
    raise SMTPAuthenticationError(code, resp)
smtplib.SMTPAuthenticationError: (535, b'5.7.0 Mailgun is not loving your login or password')

Someone knows where this error could come from ? It seems my login or password isn't good but I tried every account I had on mailgun, I even tried to create new ones...