I get emails from Exchanges about account balance? What are these about?

All the Stock Brokers are required to meet the compliance activity of uploading to the Exchange, the account balance of all clients. The Exchange then sends this information to each client through an SMS & email.

The reason this is being done is to make you aware of the available funds in your trading account and to avoid the possible misappropriation of funds. This is done in the interest of the safety of your money with the Stock Broker.