December 10, 2020 · Oskar Glauser
What is opening rate, CTR, and what does a bounce mean
If you are new to email marketing, the terminology can feel overwhelming. Open rates, click-through rates, bounces, deliverability. These terms get thrown around constantly, but nobody takes the time to explain what they actually mean and why you should care about them.
This guide breaks down the most important email marketing metrics in plain language. By the end, you will understand what each one measures, what a good number looks like, and how to use these metrics to improve your results.
Open rate
Open rate is the percentage of people who opened your email out of the total number of people who received it. If you sent an email to 1,000 people and 250 of them opened it, your open rate is 25%.
Why it matters
Open rate tells you how effective your subject line and sender name are. If people are not opening your emails, the content inside does not matter. It is the first hurdle your email needs to clear.
What is a good open rate
Open rates vary by industry, but as a general benchmark, anything between 20% and 30% is considered healthy for most businesses. Some industries, like nonprofits and education, tend to see higher rates. Others, like retail and e-commerce, may sit a bit lower.
Keep in mind that open rate tracking is not perfectly accurate. It relies on a tiny invisible image loading in the email, and some email clients block this by default. Apple’s Mail Privacy Protection, introduced in 2021, also affects tracking by pre-loading images for Apple Mail users. So treat open rates as a useful trend indicator rather than an exact measurement.
How to improve it
Write subject lines that spark curiosity or clearly communicate the value of opening. Keep them concise. Test different approaches. Sending at the right time also plays a role. And make sure your sender name is recognizable, because people are more likely to open emails from names they trust.
Click-through rate (CTR)
Click-through rate, or CTR, measures the percentage of people who clicked on a link in your email out of the total number of people who received it. If 1,000 people received your email and 50 clicked a link, your CTR is 5%.
Some platforms also report click-to-open rate (CTOR), which measures clicks as a percentage of opens rather than total recipients. This can give you a better sense of how engaging your content is for the people who actually read it.
Why it matters
CTR tells you whether your email content and calls to action are compelling enough to drive people to take the next step. A high open rate with a low CTR means people are interested enough to open, but your content is not convincing them to act.
What is a good CTR
Average CTR across industries tends to sit between 2% and 5%. Anything above 5% is generally considered strong. But context matters. A highly targeted email to a small, engaged list will typically have a higher CTR than a broad campaign sent to a large list.
How to improve it
Make your calls to action clear and specific. Tell people exactly what they will get by clicking. Use links that are easy to spot, whether that is a button in a designed email or a well-placed link in a plain text email. Keep your emails focused on one primary action rather than overwhelming readers with too many choices.
Bounce rate
Bounce rate is the percentage of emails that could not be delivered to the recipient’s inbox. When an email bounces, it means it was sent but never arrived. There are two types of bounces, and the distinction matters.
Hard bounces
A hard bounce means the email address is permanently invalid. The address does not exist, the domain is wrong, or the mailbox has been permanently closed. Hard bounces are a problem because they signal to email providers that your list is not well maintained, which can hurt your sender reputation.
You should remove hard bounced addresses from your list immediately. Most email marketing platforms, including Minutemailer, do this automatically.
Soft bounces
A soft bounce is a temporary delivery failure. The recipient’s mailbox might be full, the server might be temporarily down, or the email might be too large. Soft bounces usually resolve on their own, and the email may be delivered on a retry.
If the same address consistently soft bounces over several sends, it may be worth removing it from your list as well.
What is a good bounce rate
You want your bounce rate to be as low as possible. A bounce rate under 2% is considered acceptable. Anything above 5% is a warning sign that your list needs attention. Regularly cleaning your list and removing invalid addresses is the best way to keep bounces low.
Unsubscribe rate
Unsubscribe rate is the percentage of recipients who clicked the unsubscribe link in your email. If 1,000 people received your email and 5 unsubscribed, your unsubscribe rate is 0.5%.
Why it matters
A small number of unsubscribes with every send is completely normal and nothing to worry about. It actually helps keep your list healthy by removing people who are no longer interested. But a sudden spike in unsubscribes can signal a problem, perhaps you are sending too frequently, your content has shifted away from what subscribers expected, or your emails are not providing enough value.
What is a good unsubscribe rate
Anything below 0.5% per email is generally considered normal. If you consistently see rates above 1%, it is worth investigating why people are leaving.
Conversion rate
Conversion rate measures the percentage of email recipients who completed a desired action after clicking through from your email. That action could be making a purchase, signing up for a webinar, downloading a resource, or filling out a form.
Why it matters
Conversion rate connects your email marketing to actual business results. You can have great open rates and click rates, but if those clicks are not translating into the actions that matter to your business, something in your funnel needs attention.
How to track it
Most email platforms can track clicks, but tracking conversions usually requires integration with your website analytics. Setting up goal tracking in your analytics tool and connecting it to your email campaigns gives you the full picture of how your emails drive business outcomes.
Deliverability
Deliverability is not a single metric but rather an overall measure of how successfully your emails reach inboxes. It takes into account bounces, spam complaints, sender reputation, and whether your emails land in the primary inbox or get filtered into spam or promotions tabs.
Why it matters
Good deliverability is the foundation that all other metrics depend on. If your emails are not reaching inboxes, nothing else matters. Open rates, click rates, and conversions all start with deliverability.
How to maintain it
Keep your list clean by removing bounced and inactive addresses regularly. Use a recognizable sender name and a consistent sending address. Authenticate your domain with SPF, DKIM, and DMARC records. Avoid spammy language in your subject lines. And always include a clear unsubscribe link in every email.
If you are just getting started, our guide on how to start a newsletter covers the basics of setting up for good deliverability from the beginning.
Sender reputation
Sender reputation is a score that email providers assign to your sending domain and IP address. It is based on your sending history, including bounce rates, spam complaints, engagement rates, and list hygiene. A good sender reputation means your emails are more likely to reach the inbox. A poor reputation means more of your emails will be filtered or blocked.
How to build and protect it
Send consistently and avoid large, sudden spikes in volume. Keep your bounce rate low. Make it easy for people to unsubscribe rather than marking you as spam. Engage your list with relevant, valuable content so that subscribers actively open and click your emails.
Putting it all together
These metrics do not exist in isolation. They tell a connected story about how your email marketing is performing at every stage.
Deliverability and sender reputation determine whether your emails arrive. Open rate tells you if your subject lines are working. CTR reveals whether your content is compelling. Conversion rate shows if your emails are driving real business results. Bounce and unsubscribe rates tell you about the health of your list.
By keeping an eye on all of these metrics and understanding how they relate to each other, you can identify where your email marketing is strong and where it needs improvement. Start with the basics, track your numbers consistently, and use what you learn to make each send a little better than the last.