Outlook 2016 for Mac (aka Outlook for Mac for Office 365) has some changes compared to Outlook for Mac 2011 in regards to Junk Email Protection. This blog post will explain how Outlook 2016 for Mac handles Junk Email Protection. Please see the previous Blog post for more information on how Outlook for Mac 2011 handles Junk Email Protection. The first item to understand is that there are two types of junk email filtering: sever-side and client-side. Server-side junk filtering takes place on the mail server (such as Exchange) as soon as email arrives in the mailbox.

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Client-side junk filtering takes place on the client (such as Outlook & Outlook for Mac) when the email is downloaded from the server to the client. Outlook 2016 for Mac does not provide any client-side junk mail protection for any type of account (Exchange, POP, or IMAP). Instead, it relies solely on the mail server to perform all junk email filtering. Emails are not scanned client-side by Outlook 2016 for Mac to determine if they are junk email. Exchange servers provide server-side junk mail filtering, and most popular email providers, such as Hotmail, Outlook.com, Gmail, and Yahoo, provide server-side junk mail filtering, making client-side Outlook junk filtering redundant. It’s important to understand that junk mail filtering and blocked senders are not the same thing, although they are often used in conjunction. Junk filtering is when emails headers and content is scanned for characteristics that makes the email likely to be junk. When you add an email address to the Blocked Senders list, emails from that email address are always moved to the Junk E-Mail folder. I’ll cover and in more depth later in this blog post. Under the Outlook menu, Preferences, Junk in Outlook 2016 for Mac, you will find that there is no longer a Junk Email Protection Level setting, as there was in Outlook for Mac 2011.

This is shown in the image below. Outlook 2016 for Mac no longer has the 'Level' tab as Outlook for Mac 2011 did.

Note: While Outlook for Mac 2011 did contain the Junk Email Protection Level settings, when connected to an Exchange account, it did not perform any junk email scanning. It relied solely on the Exchange server to perform all junk email filtering.

Safe Senders When connected to IMAP, POP or an Exchange 2010 mailbox, Outlook 2016 for Mac allows you to add safe senders. However, safe senders are client-side only and do not synchronize to the server. Because Outlook 2016 for Mac does not perform any junk mail filtering, client-side safe senders no longer have any use. To explain further, I’ll use an example. Imaging that you run Outlook 2011 for Mac with client-side junk mail filtering enabled. You receive a newsletter regularly that is always found to be Junk by the junk filtering and moved to the Junk E-Mail folder. This newsletter is not junk to you, so you add the senders email address to the Safe Senders list in Outlook. Outlook 2011 now knows that email from this sender is not junk and no longer moves the email to the Junk E-Mail folder. Next, you begin using Outlook 2016 for Mac, which has no local junk filtering. The same newsletter is no longer moved to the Junk E-Mail folder because it’s no longer scanned by the Outlook junk filter to determine if it’s junk, therefore you no longer need to have the senders address in Safe Senders. On the other hand, if your mail server provides server-side junk filtering, the same newsletter may also be determined to be junk on the server before it is ever downloaded to the Outlook client.

In this scenario, adding the senders address to the Safe Senders list in Outlook for Mac would not help. You would instead need to add the senders address to the Safe Senders list on the server. When connected to an Exchange 2013 or later mailbox (including Exchange Online), Outlook 2016 for Mac does not allow you to add Safe Senders. Blocked Senders for Exchange 2013 or later accounts (including Exchange Online) You cannot manage Blocked Senders under the Outlook menu, Preferences, Junk, when connected to an Exchange account.