Hello everyone! I try to send email automatically by adding this Python code to Server action:

template_obj = self.pool.get('email.template') 
template_inst = template_obj.search(cr,uid,[('name','=','Invoice - Send by Email')])[0] 
action = template_obj.send_mail(cr,uid,template_inst,object.id,False,context)

The email has been created, based on template and with attachment of invoice, but the "send_to" field stays empty. So email stays in the folder Email->Emails. How can i solve this problem?

Thanks in advance!