Keep Subject Lines Short and Simple

A study analyzing over 40 million messages found that e-mail with the most straightforward subject lines has the highest open rates, ranging between 60% to 87%.

Some of the most effective subject lines included:

“[Company Name] Sales & Marketing Newsletter.”
“Upcoming Events at [Company Name].”
“Invitation from [Company Name].”

Conclusion: when mailing to your e-newsletter subscribers, open rates increase when you put your company name in the subject line.

Reason: these people know you and open e-mail you send. You are in their e-mail “inner circle” – the small group of organizations whose e-mails they routinely open.

Source: Internet Marketing Report