Transactional emails vs. marketing emails
A study by IBM Cloud has shown that the average unique open rate for transactional emails is more than twice as high as that for marketing emails. With an average and median of 44.7% and 45.3% respectively, transactional emails perform significantly better than marketing emails, which deliver values of 22.6% and 18.3% in the same categories. Even for brands in the lower quartile, transactional emails have a double-digit unique open rate.¹

Comparison of unique open rates between transactional emails and marketing emails
You can find tips on how to increase the open rate of your newsletters in the blog article Improving newsletter open rates through subject line testing and send time optimization.
The click-through rate is also significantly higher for transactional emails than for marketing emails. On average, they have a click-through rate three times higher than marketing emails, with values of 4.8% and 1.6% respectively. Transactional emails also outperformed marketing emails in all other metrics.

Comparison of click-through rates between transactional emails and marketing emails
You can probably guess where we're going with this. Not only are transactional emails opened more often by your customers, they are also read more often, and their links are clicked more often. Considering these statistics, it's clear that transactional emails are an excellent marketing tool. Yet their potential is often wasted.
You can find more information about email marketing personalization on our page about personalized emails.