E-mail notification is not configured

Hi,
When I try to configure the email client I get this error stating that email notification is not configured.
Please help.
Thanks.

Configure notification options
E-mail notification is not configured.
In case the computer is unattended, alerts and notifications will not be delivered to you.
To fix this problem, please configure the SMTP server and alert e-mail settings.
E-mail address not specified, e-mail notifications disabled.
