Django automatic emails not send after migrating from custom server to virtualmin

On a server, i had got a django project that send automatic emails via smtp, here is the configuration that works for my old server

EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend' EMAIL_HOST = 'smtp.lauto-resultat.com' EMAIL_PORT = 25 EMAIL_HOST_USER = '' EMAIL_HOST_PASSWORD = '' EMAIL_USE_TLS = False DEFAULT_FROM_EMAIL = 'Auto-resultat mail automatique no_reply@lauto-resultat.com'

I migrated the project on a new server with virtualmin and now the mails doesn't work

I don't understand what's the difference between my old postfix configuration and the virtualmin postfix configuration.

The server is a deebian Jessie The django project version is 1.9 And the virtualmin version is the last one

Here is the error:

SMTPServerDisconnected at /contact

Connection unexpectedly closed

Request Method: POST Request URL: https://lauto-resultat.com/contact Django Version: 1.9.6 Exception Type: SMTPServerDisconnected Exception Value:

Connection unexpectedly closed

Exception Location: /usr/lib/python3.4/smtplib.py in getreply, line 376 Python Executable: /usr/bin/python3 Python Version: 3.4.2 Python Path:

['/home/lauto-resultat/public_html', '/home/lauto-resultat/public_html/myprojectenv/lib/python3.4/site-packages', '/usr/lib/python3.4', '/usr/lib/python3.4/plat-x86_64-linux-gnu', '/usr/lib/python3.4/lib-dynload', '/usr/local/lib/python3.4/dist-packages', '/usr/lib/python3/dist-packages']

Server time: lun, 17 Avr 2017 18:01:22 +0000

Thank you for any response / help.

Here is the mx record:

mx priority 10 project.com. mail.project.com.

Thank you for any help