Assume that you configure the Safe Sendersand Recipients with the additional Trust email from my contacts option enabled in the Outlook Web App in a Microsoft Exchange Server 2016 environment. When some contacts are no longer trusted, for example, they are deleted from the trusted contacts list, email messages from those contacts land in the Inbox instead of being routed to the Junk folder.
Note Email messages from those contacts should be routed to the Junk folder in the above situation.
This issue occurs because the trusted contacts list isn't updated for contacts deletion.
To work around this issue, disable and re-enable the junk email configuration.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology that Microsoft uses to describe software updates.