Previous company spoilling name

Can I take legal action against my previous employer for spoiling my name by sending mails to clients that they have removed me.Few of clients told me that. My previous company removed me on the spot without any reason and notice. They have such mal practice to do that with employees.As they removed me I joined another company and turning clients to new company.Now previous company is trying to take revenge by spoiling my name via sending mails to clients. My previous employer is an Indian company. What action can be taken?