submit button redirecting to unknown url

VIEW

def post_share(request, post_id):
    # Retrieve post by id
    post = get_object_or_404(Post, id=post_id, status='published')
    sent = False

    if request.method == 'POST':
        # Form was submitted
        form = EmailPostForm(request.POST)
        if form.is_valid():
            # Form fields passed validation
            cd = form.cleaned_data
            post_url = request.build_absolute_uri(
                post.get_absolute_url())
            subject = '{} ({}) recommends you reading "{}"'.format(cd['name'], cd['email'], post.title)
            message = 'Read "{}" at {}\n\n{}\'s comments: {}'.format(post.title, post_url, cd['name'], cd['comments'])
            send_mail(subject, message, 'tribhuvankishor000!gmail.com',
                      [cd['to']])
            sent = True
    else:
        form = EmailPostForm()
    return render(request, 'blog/post/share.html', {'post': post,
                                                    'form': form,
                                                    'sent': sent})

URL

path('<int:post_id>/share', views.post_share, name='post_share')

TEMPLATE

{% extends "blog/base.html" %}

{% block title %}Share a post{% endblock %}

{% block content %}
  {% if sent %}
    <h1>E-mail successfully sent</h1>
    <p>
      "{{ post.title }}" was successfully sent to {{ form.cleaned_data.to }}.
    </p>
  {% else %}
    <h1>Share "{{ post.title }}" by e-mail</h1>
    <form action="." method="post">
      {{ form.as_p }}
      {% csrf_token %}
      <input type="submit" value="Send e-mail">
    </form>
  {% endif %}
{% endblock %}
FORM
from django import forms


class EmailPostForm(forms.Form):
    name = forms.CharField(max_length=25)
    email = forms.EmailField()
    to = forms.EmailField()
    comments = forms.CharField(required=False, widget=forms.Textarea)

--

regards 
Tribhuvan Kishor Bhaskar

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