ok.. this is easy... You need to change your privacy settings in My Account and turn mail notification OFF and then click Save.

Here's the direct link to email settings

If mail notifcation is set to OFF then messages are stored on our internal mail system for when you next login. Nothing will be sent to your normal email address.

Your email address will not be used by us, or passed to anyone else. We will only reply to emails we receive, so you would have to contact us first.

If privacy is an issue then please use our internal mail system, or livehelp to contact us instead.

If you need further help with this please contact support. Here's the link to contact us