Not sure how official this is but the Copy Blogger found that titling your email “You Are Not Alone” gives it the best chance of being seen by the intended recipient. Here’s what he said:
In two and a half years of sending all kinds of emails to all kinds of lists, the simple phrase “You Are Not Alone” is the most-opened subject line I’ve ever seen — by far. Because Aweber counts each email that’s been opened, even if they’re from the same user, that single subject line has had an average open rate of 90%, and has surpassed the 100% mark several times.
I don’t want to be alone is a compelling, universally recognized statement.
Give it a shot today and let us know how that goes for you after people realize you like tricking them with deceptive subject lines.