Did u setup incoming mail and outgoing mail ? 

That's how i solved mine.

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Hi 
Create a function to do the automatic action

    def to_send_email(self):
        """ Action to send an email"""

       template = self.env.ref(
            'module_name.template_id')
        for rec in self.member_ids:
        //We get the maintenance team members
            template.send_mail(self.id, force_send=True,
                               email_values={'email_to': rec.login})
                               
                               
     def create(self):
      //  supering the maintenance creation function, you can call the to_send_email function into the create function  

Hope it hepls