According to data from Return Path, 65 characters seems to be a sweet spot for email subject lines, which is about 15 characters more than the average subject line. When subject lines are 61-70 characters long, they tend to get read. However, I’ve personally found the best success from selling millions through email, is that wherever possible, short and personal get the best results. For subject lines, from 1 to 20 characters is where the magic happens.
