First things first: 

When used the right way, emojis can help you create a personalized engagement with your audience. But where do you use them? Our answer is "subject line". Your subject line is pivotal to the success of your campaign, and you can complement it with a relevant emoji. Simply put, your subject line should fit the context of your email content, and the emoji should fit the context of your subject line. 

 A/B test to find what works the best:

If you worry about the receptiveness of your audience to emojis, you can turn to A/B test experiment to find answers. Let one version carry an emoji and the other version free of an emoji. If you can continue with this pattern for a decent amount of time, you'll have your answers. Now assuming your audience reacts well to your emoji approach, you can centre your A/B test around different emojis. 

 Always preview before you hit 'send': 

It goes without saying that your users will use different browsers and devices to access their emails. Therefore, there are chances that the emojis might not render properly in some of the platforms. So to make sure you don't end up being a victim of such discrepancies, it's good to get a preview of how the emojis appear across devices and email clients. 

 Hope this helped! Stay tuned to this space for more tips on email marketing.