# views.py
from django.contrib import messages
from django.shortcuts import redirect
 
def contact_form(request):
    if request.method == 'POST':
        form = ContactForm(request.POST)
        if form.is_valid():
            form.send_email()
            messages.success(request, 'Message sent successfully!')
            return redirect('contact_success')
        else:
            messages.error(request, 'Please fix the errors below.')
    return render(request, 'contact.html', {'form': form})
 
# template (base.html)
{% if messages %}
<ul class="messages">
    {% for message in messages %}
    <li class="{{ message.tags }}">{{ message }}</li>
    {% endfor %}
</ul>
{% endif %}
 
# settings.py (add middleware)
MIDDLEWARE = [
    ...
    'django.contrib.messages.middleware.MessageMiddleware',
]
SESSIONENGINE = 'django.contrib.sessions.backends.db'