Keep it short and simple (5-8 words). You want to incorporate the most compelling and immediate benefit for someone to open your email.
Question: Subject Line OR From Line. Which of the two is the most important?
Answer: THE FROM LINE: According to Doublick, 60% of consumers say the “from line” most often determines whether they open and email or delete it. 30% open from the subject line.
Provider Coalition (source) 79% of people will hit the “Spam” button when they don’t know the sender.