I did and even searched for "MAC or Apple" to no avail. The only prevalent term is "Clearing Houses". Perhaps you are wrongly inferring that they run their systems on Macs

In fact these are not actually phishing emails ("directs users to enter details at a fake website whose look and feel are almost identical to the legitimate one") but viruses/malware which carry an attachment that is almost certainly written in Windows executable code.

And, yes, any respectable virus checker should catch these as they are not straightforward phishing attempts.

Silly question, how do you forward UNopened?

Easy! Highlight mail item in list of items in Inbox and click Forward.

You will then say that in doing this it will open the body of the email so you can insert the To: addy. True, but at least you will not have opened any attachments, wherein lies the dangers.