The most useful feature of this tool to me was its ability to filter emails from multiple different domains at once (i.e., @gmail@yahoo@hotmail). I can't think of anything i dislike about it. There's nothing really special or unique with regards to filtering SPAM messages but other tools have better reviews overall so if you're looking into one product specifically then look elsewhere! My team uses this service as part of our daily workflow process when we receive incoming emails via gmail/etc which allows us instant access and real time protection against any threats before they land within our inboxes.