Although it seems to be a popular sport to bash its effectiveness, email marketing is alive and well although the game is changing. One of the most critical keys to successful email marketing is achieving a high enough open rate to get good conversions. If your emails are not getting opened then you're not selling a thing. A compelling email subject line will lead your subscribers to click on it to find out what the email has in store for them. Let's take a look at some email subject line testing tools and strategies that you can use to boost your email marketing open rates and conversion rates. Write compelling subject lines