Hi Akhil P Sivan!
That works fine but I also tried to send notification email to the user that submit the form. It worked as well but then whenever I create a lead out of contact form, it also sends a notification email to that user.

My point here is that, can we define a mail notification only for the people who submit the form?

Hi Pedro,

This will go into some XML file

<!-- Email template for ...-->
<record id="email_template1" model="mail.template">
    <field name="name">Got new leads</field>
    <field name="model_id" ref="crm.model_crm_lead"/>
    <field name="email_from"><![CDATA[Sender Name <${(object.company_id.email or user.email)|safe}>]]></field>
    <field name="email_to">${object.email_from|safe}</field>
    <field name="reply_to">email@domain.com</field>
    <field name="subject">Got new Leads</field>
    <field name="body_html"><![CDATA[<h3>Got new Lead:</h3>
    <p>Server url.</p>
    <p>More text</p>]]></field>
</record>

This in to crm_lead

class Lead(models.Model): 
    _inherit = 'crm.lead'

    @api.mode
    def send_email_demo(self, id):
        template = self.env['ir.model.data'].get_object('module_name', 'email_template1')
        template.send_mail(id, force_send=True, raise_exception=True)