Here's 7 sure fire ways to get your emails opened.....
1) Your subject line should offer a solution to a problem.
2) Your subject line must be believable (e.g. "7 ways to...")
3) Keep it simple (simple is believable)
4) Split test, make one small change each time and track results to fully optimize your message
5) Be different from the crowd
6) Be honest with yourself and others
7) Keep repeating your message - when someone sees the same message from you 2 or 3 times, they are more likely to open it than the first time they see the message.
Hope that's helpful
Have A Great Day!