skip exception because of ALLOWED_HOSTS setting

loggingfilters.py

### in a seperated file define the function
from django.core.exceptions import  SuspiciousOperation
def skip_suspicious_exception(record):
    if record.exc_info:
        exc_type, exc_value = record.exc_info[:2]
        if isinstance(exc_value, SuspiciousOperation):
            return False
    return True

### in settings.py ###
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'filters': {
        'require_debug_false': {
            '()': 'django.utils.log.RequireDebugFalse'
        },
        'skip_host_check': {
            '()': 'django.utils.log.CallbackFilter',
            'callback': skip_suspicious_exception,
        }
    },
    'handlers': {
        'mail_admins': {
            'level': 'ERROR',
            'filters': ['require_debug_false', 'skip_host_check'],
            'class': 'django.utils.log.AdminEmailHandler'
        }
    },
    'loggers': {
        'django.request': {
            'handlers': ['mail_admins'],
            'level': 'ERROR',
            'propagate': True,
        },
    }
}