While it's easy add senders or domains to the Safe Senders list in Outlook, it is also easily forgotten. Fortunately, Outlook has a nice feature that helps you building your list of known contacts. It can automatically add everybody you send an email to the list.
Whitelist People You Mail Automatically in Outlook
To put anybody who you email on your Outlook white list automatically:
- Select Actions | Junk E-mail | Junk E-mail Options... from the menu.
- Go to the Safe Senders tab.
- Make sure Automatically add people I e-mail to the Safe Senders List is checked.
- Click OK.