Agreed with my sibling post, that email would probably get flagged and dropped as spam before it got to the accountant.
I've seen an email like this aimed at the company I work for and it was something like ceo@yourrcompany.com (just one letter was doubled from the real domain).
If it was flagged as spam it would probably be due to a misconfiguration on the fraudster's end. There might be some anti-spam systems that might be looking for this now but I've yet to see it listed as a feature.
I've seen an email like this aimed at the company I work for and it was something like ceo@yourrcompany.com (just one letter was doubled from the real domain).