That's two hours that you could have used to accomplish the many pressing tasks involved in running your business. This spam is robbing you of your day and harming your business growth. If you are paying for metered email, spam is also costing you directly. One of the simplest things you can do is to set up email filters. If you don't know how to do this, read the help files that came with your email client.
Online help is also often available.
However it is very important that you learn to set up and use filters. You want to set up filters to send unwanted email to the trash. You want to set up filters based upon subject line, sender, and key phrases. Therefore you may want to set up a filter that looks for this phrase and automatically sends any email containing it to the trash. Likewise, spam emails often mentions U.S. legislation which makes it legal to send spam emails.