OK, I don't know the answer yet, but I have a guess. My assumption is that adding a relevant emoji at the front of the subject line will help to increase the open rate of my newsletters. Given that my audience is software developers, and all self-respecting engineers adore emojis 🤩.
Some context: One of my projects, LibHunt, has a total of ~13,400 subscribers of its newsletters. Some examples are Awesome Ruby Newsletter & Awesome Python Newsletter. The open rate has been dropping slowly over time and is ~42% right now.
As a simple measure to increase the open rate of the emails, I’ve decided to run a small experiment. Starting from this Friday, I will be inserting a relevant emoji at the beginning of all subject lines. For example, Ruby - 💎, iOS & Swift - 📱, Python - 🐍, Java - ☕, and 💻 for everything else.
Now, if you wish to take part in this experiment, you can write down your guess. (A) Open rate will go UP, (B) it will STAY as it is (C) it will go DOWN.
Then, I will report the results next Friday afternoon (Sydney time).