Outlook for Mac 2011 handles Junk E-mail differently depending on the type of email account you are using (such as Exchange or POP/IMAP) and the server version you are connected to if connected to Exchange.  I will explain these differences in order to help you make the most of your Junk E-mail filtering capabilities in Outlook for Mac 2011.

Connected to Microsoft Exchange Server:

The most important thing to know is that Outlook for Mac 2011 does not perform any Junk Email filtering for Exchange accounts.  Outlook for Mac 2011 relies solely on the Exchange Server to perform all junk filtering.  Emails are not scanned by the Outlook for Mac 2011 client to determine if they contain typical “junk” content.


In Outlook for Mac 2011 version 14.3.1 and earlier, the Junk Email Options and Blocked Senders options under the Junk button on the Ribbon were available and you were able to modify these settings, however when Outlook was connected to an Exchange server, these settings and the Blocked Senders list were ignored.  If you added email addresses to the Blocked Senders list, emails from these senders would still be delivered to the Inbox, as the Blocked Senders list was ignored and no client side junk filtering would take place.

If you are running an out-of-date Outlook for Mac 2011 client, it’s best to install the latest updates to ensure you have all the latest features and fixes.  The latest updates can be downloaded on the Mac client by clicking Help, Check for Updates, or at the following URL under the Office for Mac updates section: http://www.microsoft.com/mac/downloads


In Outlook for Mac 2011 version 14.3.2 and higher, some changes were made to the Junk Email feature that are specific to the version of Exchange Server you are connected to.

Outlook for Mac 2011 14.3.2+ connected to Microsoft Exchange Server 2013:

    • The Junk E-mail Protection… option under Junk is greyed out and inaccessible.
    • You are able to add an SMTP Address to the Blocked Senders list on the Exchange server from the Outlook for Mac 2011 client.
      • To add an email address to the Blocked Senders list, select an email (or multiple emails), then click Junk on the Home ribbon, and then click Block Sender.  This adds the SMTP address of the email that was selected to the Blocked Senders list on the Exchange Server, so all emails from this SMTP address will now be considered Junk and routed to the Junk E-mail folder automatically as soon as they arrive in the Mailbox, even if Outlook for Mac 2011 is not running. 
    • You are not able to view or manage the Blocked Senders list from the Outlook for Mac 2011 client.  In order to view or manage the Blocked Senders List, you can login to Outlook Web App (OWA).

You can still click Junk, then Mark as Junk to manually move an email to the Junk Email folder and assign it the Junk category.

Outlook for Mac 2011 14.3.2+ Connected to legacy Microsoft Exchange Server (2007 or 2010):

    • You are able to add local Blocked Senders.  To do this, select an email, click the Junk button on the Home ribbon, and click Block Sender, or open Junk E-mail Protection and manually add an email address to the Blocked Senderslist. 
      • This Blocked Senders list is local to the Outlook for Mac 2011 client only.  Any senders blocked in Outlook for Mac 2011 when connected to a legacy Microsoft Exchange Server will not be synchronized to the server and will only take effect when emails arrive in the Outlook for Mac 2011 client that hosts the local blocked senders list.

As always, you can still click Junk, then Mark as Junk to manually move an email to the Junk Email folder and assign it the Junk category.

Connected via POP or IMAP:

When you are connected to your email account using POP or IMAP, you can take full advantage of the Junk E-Mail filtering capabilities in Outlook for Mac 2011!  First of all, if you click the Junk button on the Home ribbon, you can click Junk E-mail Protection… to set and manage your Junk E-mail Protection settings.  Here, you can set the Level of protection (None, Low (default), High, or Exclusive – see screenshot below), and manage your Safe Domains and Blocked Senders.  You can also mark emails as Junk or block the senders of emails by selecting the email(s), clicking the Junk button, then Mark as Junk or Block Sender.  When you mark an email as junk, the email is moved to the Junk folder and the email is assigned the Junk category, however future emails from this sender may still arrive in your Inbox.  When you block a sender, the email that was selected will remain in your Inbox, but all future emails from this sender will be routed to the Junk folder.


More Information:

http://office.microsoft.com/en-us/mac-outlook-help/about-junk-e-mail-protection-HA102928231.aspx - About junk e-mail protection
  *Please Note at the end of the article: Outlook does not apply the junk mail filter to messages from a Microsoft Exchange account. For these accounts, junk mail filtering occurs on the Exchange server.

http://support.microsoft.com/kb/2831332 - Senders on the Blocked Senders list are not blocked in Outlook for Mac 2011