Emails not working

Email host error

admin_info = User.objects.filter(is_superuser=True)
admin_emails = []
for i in admin_info:
            admin_emails.append(i.email)
send_mail(
                'New Car Inquiry',
                'You have a new inquiry for the car ' + car_title + '. Please login to your admin panel for more info.',
                'rathan.kumar049@gmail.com',
                admin_emails,
                fail_silently=False,
            )