In fact - NO.   Try to reply to that emai, and you will see that it put into the Receiver field not BM email.  But if you look into original email, you will see that it indeed looks like as sent from Bitmain.   

There is a "display" name on  emails, which can be different from the sender's email - for example:  "John Smith".   But when you reply it - you will see smth like johnsmith@gmail.com   (just an example).

So fraudsters just substituted the "display" email with the real Bitmain's one.