As a side note, in O365 and a few other mail providers, you can set it up to drop any email into your spam folder that is not from someone on your contacts. I

As a side note, in O365 and a few other mail providers, you can set it up to drop any email into your spam folder that is not from someone on your contacts. I get a lot of spam on my work email, but I don't open any of it. All of it ends up in the spam folder. No idea if gmail supports something like this.