Log onto your Plesk account.
On your Dashboard, click onto 'Mail' on the left-hand side.
Near the top of the screen, click on 'Email Settings'. From here, you can activiate or deactivate services on your email services by clicking on 'Activate/Deactivate Services'.
You can also set a safe limit for the amount of messages that can be sent via your account, by clicking on 'Limit Outgoing Messages'.
