I know this thread is 3 years old, but I registered here just to say "thank you". I am so glad y'all have previously discussed this. This guy recently reached out to our shop for printing some flyers. His email was devoid of company details, etc. and it just seemed a little off, especially since it came out of the blue (we mainly print for local folks, so we usually know our customers even if they're first timers).
Anyway, I appreciated that once I googled the email that my suspicions were confirmed on this very site. Thanks again y'all. Have a great weekend.