[Skunkworks] BLOCKING SPAM USING SENDERS NAME AND NOT USING THE DOMAIN NAME OR EMAIL ADDRESS

Hi Skunks, I have a guy spamming my network and every time i block the email address and IP address on my firewall he sends with a different address, domain and ip address. I would like to know if there is a way i can block such a person. -- Kind regards Peter Ngali, peterngali@gmail.com Mob: +254 722569981