in this condition, i want to it keep creating the mail.message records, but NOT sending the email. 

class MailMessage(models.Model):    
	​	​_inherit = 'mail.message'
   	​@api.model_create_multi    
	​	​def create(self, vals_list):
	​		​​for vals in vals_list:
            body = vals['body']
            if isinstance(body, Markup):
                body_text = Markup.unescape(body)
                if body_text[:5] == "gpt: ":

please help, i cant find any solution that meet my requirement anywhere. thank you