It is easy to adjust your junk email preferences to automatically allow messages from specific domains or block messages from specific email addresses or domains.
To allow all messages from a specific domain, in the most recent versions of Outlook, go to Junk Email Preferences on the Tools menu, click the Safe Senders tab, and then type the domain name. For example, if you add “beachhouse.com” to your Safe Senders list, a message from a person with an email address that contains “@beachhouse.com” is never classified as junk.
To block all messages from a specific email address or domain. Click the Blocked Senders tab, and then type the email address or the domain name. For example, if you add “mountainretreat.com” to your Blocked Senders list, a message from a person with an email address that contains “@mountainretreat.com” is always classified as junk.
You can also move a message to your Junk E-mail folder or block a sender from your Inbox: To classify a message as junk and move it to your Junk E-mail folder, Ctrl+click or right-click a message header and then click Junk Mail / Mark as Junk.
To classify a message as junk and block the sender, Ctrl+click or right-click a message header and then click Junk Mail / Block Sender.
Office 2011 works the same except that on the Tools menu, click Junk E-mail Protection. And choose the level of junk e-mail protection that you want. Unless the level of junk e-mail protection is set to None, legitimate messages might be classified as “junk” and put in the Junk E-mail folder. Check the Junk E-mail folder regularly to make sure that it doesn’t contain any legitimate messages.
Add important people to your Outlook contacts. When a contact is saved in your contacts list, Outlook does not classify messages from that email address as junk.
Junk email protection is available for all supported email accounts except Exchange. For Exchange accounts junk mail filtering must be configured in the admin panel for Exchange Online.