It's worth spending half an hour digging into the capabilities of your chosen mail app to learn how to set up inbound mail filtering rules. It's dead easy to route anything that doesn't come from a whitelist to a 'PotentialJunk Folder' for example, or just delete it straight away.
Quite a lot of ISPs seem to be ok at spotting traditional spam type stuff but are less good at identifying scams. You can set up your whitelist very easily with most email software. Every time you get a legitimate email from someone like your bank or building society, you just add that sender domain to a group. With Mac Mail I then have rules which say things like "If Subject contains 'your account' and sender not in {Whitelist} then move to {Suspect Mail Folder}.
Anything that makes it harder for you to inadvertently click on a link or open an attachment is good for you and bad for scammers..
