Impact de la longueur de l’objet d’un mail
We did an analysis on all acquisition campaigns sent through our Postmaster Direct Network over the last two years. We found that response rate (as measured by clicks) goes down dramatically when the subject line is longer than 50 characters. How dramatic is this difference? Click-through rates for subject lines with 49 or fewer characters were 75 percent higher than for those with 50 or more.
via In the Know (Return Path)