View the headers and use regex (if your mail provides that level of details in rules) to block the the PTR records and reverse DNS from sending to you. If not then block emails based on keywords in the subject or body. If that isn't an option contact your mail provider and have them block it. Or find a better mail provider that gives you better filter rule options. Also start submitting the headers/emails to Spamcop. [1]
Comments
View the headers and use regex (if your mail provides that level of details in rules) to block the the PTR records and reverse DNS from sending to you. If not then block emails based on keywords in the subject or body. If that isn't an option contact your mail provider and have them block it. Or find a better mail provider that gives you better filter rule options. Also start submitting the headers/emails to Spamcop. [1]
[1] - https://www.spamcop.net/