To edit your internal SITE123 webmail mailbox settings:
Log in to your SITE123 Webmail.
Click the Options tab at the top of the page.
On the side menu, you will see four expandable setting sections: General, Mail, Calendar, and Advanced.
Each category has several sub-options where you can adjust settings for many features, such as adding image background, changing account info, setting forwarding emails, adding a blacklist, and many more.