Just recently, I've started to be bombarded by Gmail spam.  Really crude stuff - around 100 a day.

The Gmail spam filters aren't catching it.  The only thing that goes into Gmail's junk folder are the occasional genuine email.

I'm at a loss as to what to do.  I can't see any gmail settings that I can tweak to make the spam filter more aggressive.

It's just the standard free gmail.

Can anyone help .... please.