DJANGO: send_mail is not throwing errors or exceptions

Question

I want to send smtp emails. But it is not working and I do not know how to debug this problem.

In my settings.py I set a complete wrong port:

EMAIL_PORT = 3

In the Django shell I run this script without getting an error. send_mail is just returning 1 after execution.

from django.core.mail import send_mail

send_mail(
    'Test Email',
    'That is an test.',
    '[email protected]',
    ['[email protected]'],
    fail_silently=False,
)

I also have configured an error logger, which should log everything. But it is also not appearing anything in my logfile:

...
    'loggers': {
        '': {
            'handlers': ['file'],
            'level': 'DEBUG',
            'propagate': True,
        },
...

Is this the default behavior? I guess no? What I am doing wrong?