If you don't pay by your payment due date, your email account may be suspended until the payment is received and restrictions applied. For example you will not be able to send email.

To remove restrictions and complete your payment, please follow this guide: Suspended email account

If no action is taken to remedy the payment issue, further restrictions will be applied to your email account and it will be scheduled for deletion.

You can still recover your account at this point, immediate action is required to recover your email account, please follow this guide: Account pending deletion