I have this browser and I receive by mail through a BT address. I get about 99.99% (at least that is what it seems!) protection from spam, they are diverted into the Bulk Folder, the wanted mail into the Input box.
It's then a simple matter of clicking on the Buld Folder(it shows 25 mails at a time) - check for the odd 'good' mail ( dodgy address perhaps?), if all bad then tick either of the two check boxes and delete. Easy.