I am not sure how to block senders but you might be able to look that up based on the email provider you use.

One thing that a lot of people tend to do is utilize throw away accounts. These are, essentially, accounts that they set up if they sign up for things that might result in giveaways.

I kind of have something like this. I have an account that all my official emails go to and then I have an email account that I send everything else too. This way, my official account doesn't get as bombarded with junk mail and then I don't have to worry about missing something important or anything like that.

Best regards.