Testing subject lines can help you increase your response and profits.
But the truth is we never know for sure what will work best.
Which of these subject lines would you choose as the winner? The target audience is investors.
A.  Biotech Specialist says $8.36 billion disruptive meltdown ahead
 
B.  Rare, FDA, fast track creates triple digit play
 
C. Re: The coming big pharma meltdown-a triple digit play
 
D. The end of prescription pain-drug side effects could ignite this play
 
Results….
If you guessed A, you were right!
A resulted in a 15% higher open rate than B
A resulted in a 39% higher open rate than C
A resulted in a 67% higher open rate than D
What do you think?