Exchange 2010 anti-spam does not work after uninstalling Forefront

I installed Forefront Security for Exchange for testing, and later removed it because I couldn't afford to let Forefront use over 1GB of RAM on my server. After removal, the built-in anti-spam wasn't working anymore. I discovered that content filtering had been disabled, so I re-enabled it but spam still sails on through. I reinstalled the hub transport role and enabled anti-spam, but the spam keeps on coming. I checked the headers on incoming email for SCL and PCL stamps, there are none. What else can I check that Forefront may have monkeyed with?

Hi,
Thank you for the post.
Before going any further, I’d like to confirm whether you have installed Forefront Security for Exchange(FSE) on Exchange 2010. In fact, it cannot be installed.
As far as I know, you should install Forefront Protection 2010 for Exchange Server (FPE) on Exchange 2010. When you installing FPE, the opt into antispam will disable Exchange's basic content filtering agent as FPE installs its own content filtering agent.  And uninstalling FPE will not re-enable this agent so you will have to do so manually.
Regards,
Nick Gu - MSFT

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