The following procedure will help you to send detailed emails about errors:

1. If you do not already have LOGGING settings set up for your project, set those up first. Find the Django logging utilities file, available at lib/python3.6/site-packages/django/utils/log.py. This lib/ directory will be in either your virtual environment myproject_env/ or /usr/local/ in a Docker project's app container. You can open the file in a text editor (or via the more command in a terminal) and copy the DEFAULT_LOGGING dictionary to your project's settings.py as the LOGGING dictionary.
2. Add the include_html setting to the mail_admins handler. The result of the first two steps should be something like the following:

# settings.py or conf/base.py
DEFAULT_LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse',
        },
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        },
    },
    'formatters': {
        'django.server': {
            '()': 'django.utils.log.ServerFormatter',
            'format': '[{server_time}] {message}',
            'style': '{',
        }
    },
    'handlers': {
        'console': {
            'level': 'INFO',
            'filters': ['require_debug_true'],
            'class': 'logging.StreamHandler',
        },
        'django.server': {
            'level': 'INFO',
            'class': 'logging.StreamHandler',
            'formatter': 'django.server',
        },
        'mail_admins': {
            'level': 'ERROR',
            'filters': ['require_debug_false'],
            'class': 'django.utils.log.AdminEmailHandler',
            'include_html': True,
        }
    },
    'loggers': {
        'django': {
            'handlers': ['console', 'mail_admins'],
            'level': 'INFO',
        },
        'django.server': {
            'handlers': ['django.server'],
            'level': 'INFO',
            'propagate': False,
        },
    }
}