exchange 2013 anti-spam sender ID filter not working

Hello All,

Though I installed the anti-spam filters on the Exchange 2013 Mail servers, and made sure to aneble them, I see that most SPAM is just arriving at the users mailboxes. The logging of the spam filters is showing that the messages are qualified as non-spam (SCL 0) by the Content Filter. But the Sender ID filter should have blocked these mails already, because the IP address which is sent from is on several blacklists. I have setup the IPblocklistproviders as follows:

[PS] C:\Program Files\Microsoft\Exchange Server\V15\scripts>Get-IPBlockListProvider
Name                                           LookupDomain                                  Priority----                                          ------------                                   --------
SpamHaus                                       zen.spamhaus.org                              6SpamCop                                        bl.SpamCop.net                                7
surriel                                        psbl.surriel.com                              8
sorbs                                          dnsbl.sorbs.net                               9
ix.dnsbl.manitu.net                            ix.dnsbl.manitu.net                           10
combined.njabl.org                             combined.njabl.org                            11
cbl.abuseat.org                                cbl.abuseat.org                               12
spam.rbl.msrbl.net                             spam.rbl.msrbl.net                            13
bl.spamcannibal.org                            bl.spamcannibal.org                           14

Can you please help troubleshooting what is going wrong?

Regards,

Stephan van der Plas

You know you're an engineer when you have no life and can prove it mathematically