ContentFilterPhrase filtering not working

Hi!

I recently installed a combined Transport/Mailbox server, and installed the antispam engine.

I've tried to make the ContentFilterConfig tight, and added Phrases. But even though it says Enabled $True, especially my boss his mailbox is spammed relentlessly. Tried activating the mailbox junkmail setting (Set-Mailbox <MailboxIdentity> -AntispamBypassEnabled $true...), but that didn't make any difference.

Some messages are entering the Junkmail folder, some are sent to the Spam mailbox, but the majority of the most obvious spam is still entering his mailbox. So I disabled the Junk setting on the mailbox and tried using ContentFilterPhrases, using the spam text of the mails still present in the mailbox. I rebooted the server just to make sure it would process any changes.

Nevertheless, very explicit spam with exactly the same text as I entered in the Phrases section still comes in.

Some results of the ContentFilterConfig:

Name                                  : ContentFilterConfig
RejectionResponse                     : Message rejected as spam by Content Filtering.
OutlookEmailPostmarkValidationEnabled : True
BypassedRecipients                    : {}
QuarantineMailbox                     :spam@domain.local
SCLRejectThreshold                    : 6
SCLRejectEnabled                      : True
SCLDeleteThreshold                    : 8
SCLDeleteEnabled                      : True
SCLQuarantineThreshold                : 2
SCLQuarantineEnabled                  : True

Enabled                               : True
ExternalMailEnabled                   : True
InternalMailEnabled                   : False

Or should I best install an Edge server?

Thanks guys!