Email Routing: does Cloudflare do any filtering/drop at the MX?

Does Cloudflare employ any techniques to drop obvious spam messages at the MX or does it forward absolutely everything, in particular for catchall setups?

Does it have any issues with Gmail for potentially forwarding lots of spam?

Other forwarders seem to do some filtering, which I personally don’t like because of the false positive risk and potential delays from greylisting:

A post was merged into an existing topic: Cloudflare Email Routing (beta) - Antispam