I am surprised mail servers are still allowing this type of message through.
Go on, blame the messenger !
More surprising should be that some people still think it's a good idea to open attachments in unsolicited emails, comes a time when they have to take responsibility for their own ignorance and the potential consequences thereof.
In that particular email, which is not untypical of it's genre, and regardless of any attachments, just which part of either it's content or wording would any sane and rational person even begin to believe was genuine ?????
The point is most mail servers have functioning anti-malware scanners - but seemingly not all.
You are right that most people nowadays see through a scam - however not all - otherwise the malware vendors would have gone out of business.
We have had an Advance Fee Fraud using the name of someone at the business. Most recipients have forwarded the e-mails to us to alert us. However at least one person fell for it entirely and it was only one of her colleagues who stopped her doing something very silly.
Hence why mail systems should include an anti-malware!