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How do I configure emails to be deposited to the junk email folder?

IMF Tune does not change anything in the way emails are moved to the junk email folder. Hence this is purely a matter of configuring the Exchange Content Filter and the email clients.

Below we walk through the basic server-side configuration. Once configured, emails will end up in the junk folder for all mailboxes for which this functionality is enabled. Important: There exists a per mailbox enablement setting that ultimately determines whether or not the Junk Folder is to receive emails. For more details check: Why aren't emails ending in the junk email folder?

Exchange 2007/2010/2013/2016/2019 Content Filter

The Content Filter forms part of a set of anti-spam transport agents that ship with Exchange 2007 up to 2019. These must be run on a server having the Edge or Hub transport role.

As from Exchange 2013 a distinct Hub Transport server role is no longer available. Instead the Hub Transport is included with the Mailbox Server role. Thus the Content Filter agent is run on the Mailbox Server role.

Depending on your specific Exchange version you may need to manually install the anti-spam agents from the command shell. The installation script is located under:
<Exchange Server dir.>\Scripts\install-AntispamAgents.ps1

1. On the Exchange Edge/Hub transport server machine, open the Exchange Management Shell.

2. Change directory to: <Exchange Server dir.>\Scripts\

3. Run> .\install-AntispamAgents.ps1

4. Restart the MS Exchange Transport service

With the Anti-spam agents installed we can now configure the Junk Threshold. Again we have to use the command shell:
Set-OrganizationConfig -SCLJunkThreshold <SCL threshold value>

<SCL threshold value> is the threshold value between 1 and 9. Emails with an SCL greater (but NOT equal) to the threshold will be moved to Junk.

To check the current threshold setting we can run the cmdlet:
Get-OrganizationConfig