Rather than using filters, Business Email uses Sender Verify
In short your mail must come from a real email box (most spam is sent from faked boxes)
Here is an overview from the Sussex University
An example.... ONE locksmith goes creates sloppy locks that will open with just about any key. His customers are thrilled... their doors always open with their keys.
ANOTHER quality locksmith makes locks that require a precisely cut key... cheap copies hastily made at Home Hardware won't work.
Which locksmith will you choose?
The first is a wonderful popular choice as there are few complaints about locks not opening.... until clients start discovering just about anyone can open their front door.
COOLCOM Business Grade Email servers are precise and restrict email from non-verifiable mail servers.
If you think someone sent you mail that was missed, you have a clever tool in your cPanel that lets you view all mail coming in; in the rare event you see one that should have made it past verification just let us know. We make it so their mail arrives from now on.