Hi Lisa! - What Not to Write as an Email Subject

I recently received an email in my inbox with the subject line “Hi Lisa!” The from address only said “Suz.” I get hundreds of emails a day and this is the type of thing that I would normally just send to my spam folder – between the dubious subject line and the cryptic “from” address, it really triggered all my red flags. But I had just sent a few photos, via Facebook, to a friend named Suzanne...