The issue has yet to be a virus on an Apple OS machine. If you want to explore more I'd head to Bleeping Computer but NEVER open email from folk you don't expect email from. Spam and "bad emails" account for about 1/2 of the 370 billion emails sent every day.
Delete them. Do not open, do not follow their instructions.
https://www.bleepingcomputer.com/download/mac/anti-malware/ has some anti-malware but for over a decade, I've yet to have a client show me an Apple OS virus.
I have what I believe is a virus that is affecting my email. I have Mac Pro with the latest OS. I have been receiving email that appears to be corrupt in that mostly random characters. But within that, there is excerpts from other emails; other emails from a different sender.