I'm considering cPanel for a customer and I need to know a few things. I'm also considering directadmin

Does the interface support multiple MX recirds. Someone told me it didn't. That could be a deal breaker.

Does the system allow email to be accepted for domain where no MX record points to a local server? This would be the case for front end spam filtering services where all MX records point to the filtering host which then forwards on to the customer's server.

Thanks in advance

You can modify the DNS Zones in WHM (part of cPanel, used by resellers and root) to add multiple MX records.