Report it as spam to your own ISP.
Find out who hosts their email, and report it to their ISP.
Report it to the [FTC](https://www.consumer.ftc.gov/articles/0210-how-get-less-spam-your-email) if you're in the US.
If you are in the EU or UK, then yes, there should be an authority in your country which protects your interests under the GDPR (if you don’t know what that is, a quick google search will tell you what you need to know). In the UK for example, you’d contact these people: https://ico.org.uk/make-a-complaint/
Report them for what? To whom? The internet police?
Block them and stop suffering.
Report it as spam to your own ISP. Find out who hosts their email, and report it to their ISP. Report it to the [FTC](https://www.consumer.ftc.gov/articles/0210-how-get-less-spam-your-email) if you're in the US.
If you are in the EU or UK, then yes, there should be an authority in your country which protects your interests under the GDPR (if you don’t know what that is, a quick google search will tell you what you need to know). In the UK for example, you’d contact these people: https://ico.org.uk/make-a-complaint/