This document details how to add emails to your safe sender's list. To list someone in your safe sender's in Outlook 2011, you will need to add them to your address book.
Once you have selected contacts, a new window will open. On this new window, type in your contact's name and e-mail address.
Once you have added your contact into your address book, it will be automatically added to your safe sender's list. E-mails from this sender will now arrive to your inbox.