Outlook 2010 has a junk email filter that helps reduce unwanted email messages in your Inbox. Junk email or spam mail is moved to the Junk Email folder by the filter. The filter evaluates each incoming message by looking at the time the message was sent and the content of the message to help determine if it might be spam. By default, the junk email filter is turned on and the protection level is set to Low. This level catches only the most obvious spam. You can make the filter more aggressive by changing the level of protection that it provides. The suspected spam message delivery is not stopped, but it is moved to the Junk Email folder. Use the steps below to adjust settings in the Junk Email Options dialog box.
On the Home tab, press the Junk button, and select Junk Email Options...
The Junk Email Filter Lists give you control over what is considered spam. You can add names, email addresses and domains to these lists.
Safe Senders List - Email addresses and domain names in the Safe Senders List are never treated as junk email. When using a Microsoft Exchange Server account with Outlook, all names and addresses in the global address list (GAL) are automatically considered safe.
Safe Recipients List - If you belong to a mailing list, you can add the list sender to the Safe Recipients List. Messages sent to these email addresses or domain names are never treated as junk.
Block Senders List - You can easily block messages from particular senders by adding their email addresses or domain names to the Blocked Senders List. When you add an item to this list, Outlook moves any incoming message from that source to the Junk Email folder. Messages from people or domain names that appear in this list are always classified as junk regardless of the message contents.
Blocked Top-Level Domains List - Click the International tab in the Junk Email Options window to access the Blocked Top-Level Domain List. To block unwanted email messages that come from another country/region, you can add country/region codes to this list. For example, selecting the CA [Canada], US [United States], and MX [Mexico] check boxes in the list would block messages from email addresses that end in .ca, .us, and .mx.
Blocked Encodings List - To block unwanted email messages that appear in another character set or alphabet, you can select encodings to add to the Blocked Encodings List.
To manually add a domain to Safe Senders or Safe Recipients or Block Senders, do the following: