We've been a target of this attack previously and it's not as simple as email spoofing as email addresses aren't (in Google Apps at least) displayed prominently

We've been a target of this attack previously and it's not as simple as email spoofing as email addresses aren't (in Google Apps at least) displayed prominently, firstname.lastname@gmail.com with a corresponding name and profile picture is how we were targeted. Very easy to fall for (especially in companies that aren't strict about personal/professional email separation).