Is there a way to block IP addresses?
I have been receiving Phishing emails that are spoofing my email address.
I would suggest to contact your mail server tech support (if you haven’t already) and ask them to setup the IP block on the mail server block list. That’s usually the easiest way to block an IP.
Also there is many websites where you can report an IP address for that type of thing. One such site is Cleantalk.org. Also AbuseIPDB is another.
Also contact your ISP as they can usually also submit an IP address for sending spam / phishing emails via their own methods, and give you advice.
Lastly most countries also have official government web sites to report phishing & spam abuse etc going on. So do a search via your government websites on that to report the IP.