Good subject lines are often personal or descriptive, and give people a reason to check out your content. Whatever your approach, its important to keep your audience in mind, and test different words and phrases to see what they prefer.
Why do I need a subject line?
It is the first impression, it is your tagline, it is the reason the recipient will, or will not open it. The purpose of the subject line is to get the person reading to say three simple words: Tell me more. If you think about it, an emails subject is much like a company tagline.
How do you name a subject line?
If someone referred you, be sure to use their name. Put it in the subject line to grab the readers attention right away. Moreover, she suggests beginning the subject line with the full name of the person who referred you.