Email marketing remains one of the highest-return channels available to UK businesses — but only if people actually click. The clickthrough rate (CTR) is the metric that separates a list that earns money from a list that just sits there. This guide explains what email CTR really measures, what drags it down, and the practical levers that lift it, without the gimmicks.
What clickthrough rate actually tells you
CTR is the percentage of delivered emails that result in at least one click. It is the bridge metric: opens tell you the subject line worked, clicks tell you the content worked, and conversions tell you the landing page worked. A campaign can have strong opens and weak clicks, which points squarely at what is inside the email.
Two things to keep in mind when interpreting it. First, unique CTR (unique clickers divided by delivered) is more meaningful than total clicks, because one enthusiastic person clicking everything should not flatter your numbers. Second, CTR must be read alongside click-to-open rate — clicks as a share of opens — which isolates content performance from subject-line performance.
Benchmarks exist for UK industries, but treat them as rough context, not targets. A niche B2B list and a retail promotional list are different animals, and comparing your numbers to a blended average usually misleads more than it helps.
Why most emails do not get clicked
The reasons are rarely mysterious. The most common is a mismatch between the promise and the payload: a subject line that suggests one thing, an email that delivers another. Readers who feel tricked once become readers who do not open twice.
Then there is the "everything email" — the newsletter that tries to cover six topics, with six links, and no clear reason to click any of them. Attention is scarce; every additional link competes with the others. Emails with one clear job almost always outperform emails with five vague ones.
Other frequent culprits: calls to action buried below the fold, buttons that look like text, emails designed for desktop that break on phones (where most UK email is now read), and content that reads like it was written for the business rather than the reader.
The levers that genuinely lift CTR
Start with relevance, because it dominates everything else. A targeted email to a segmented list will beat a clever email to everyone. Segment by behaviour — what people bought, browsed or asked about — not just by demographics. A lapsed customer and a new subscriber need different emails, and sending them the same one halves its effectiveness for both.
Next, give every email one job. Decide the single action you want, make the whole email serve it, and make the call to action unmissable: a real button, early in the email, repeated once for longer messages. Vague links like "click here" underperform specific ones like "see the March availability".
Then fix the basics that compound: preview text that supports the subject line, pre-header copy that is not "view in browser", alt text on images for the many clients that block them by default, and a plain-text version that still works. None of these is exciting. All of them show up in the numbers.
We cover email as part of broader digital marketing programmes, and the pattern is consistent: the businesses that treat email as a revenue channel, with proper segmentation and testing, get a disproportionate share of their online revenue from it.
Testing without fooling yourself
A/B testing subject lines and content is worthwhile, but only if the tests are honest. Test one variable at a time, give the test enough sends to mean something (a test on 200 recipients proves nothing), and decide in advance what winning looks like — more clicks, not just more opens.
Watch out for the trap of optimising for the wrong metric. A curiosity-gap subject line can lift opens while depressing clicks, because the people it attracted were never interested in the content. Always follow the metric chain through to clicks and, where possible, to revenue.
Keep a simple log of what you tested and what happened. Over a year, that log becomes one of the most valuable marketing assets you own: a record of what your specific audience responds to, which no benchmark report can give you.
Keeping your list healthy
CTR decays when lists decay. People change jobs, change interests, and stop engaging. Continuing to email the long-disengaged drags down your rates and, worse, harms your sender reputation with mailbox providers.
Run periodic re-engagement: a short sequence to cold subscribers offering something genuinely useful, and remove those who stay silent. A smaller, engaged list will outperform a large, dead one on every metric that matters — and it costs less to send to.
For the bigger picture of how email fits with your other channels, see our guide to integrated marketing. And if your email programme needs a proper overhaul, talk to us — we will audit what you are sending and tell you honestly where the clicks are being lost.
Subject lines: the gatekeeper metric
None of the click-optimisation above matters if the email is never opened. Subject lines deserve their own discipline. The principles that hold up: be specific rather than clever ("Your March availability is now open" beats "Exciting news inside!"), keep them short enough to survive a phone screen, and make sure the subject's promise is paid off in the first lines of the email.
Avoid the tricks that trade long-term trust for short-term opens: misleading subjects, excessive urgency, and clickbait that the content cannot support. They work once, then your audience learns to ignore you — the most expensive outcome in email marketing.
Personalisation helps when it is real. Using the recipient's name is table stakes; referencing their actual behaviour — the category they browsed, the service they asked about — is what moves numbers. But relevance beats personalisation tokens every time: a genuinely useful email to a well-chosen segment needs no name merge to get clicked.
Raise your clickthrough rate and everything downstream improves — more traffic to your offers, more conversions, more revenue per send. It is unglamorous, compounding work, which is exactly why most competitors never bother.
FAQs
What is a good email clickthrough rate?
It depends on your industry, list quality and email type. Rather than chasing a universal benchmark, establish your own baseline, segment your sends, and aim to improve your own numbers quarter by quarter. Your trend matters more than anyone else's average.
How is click-to-open rate different from clickthrough rate?
CTR divides clicks by delivered emails; click-to-open rate divides clicks by opened emails. CTOR isolates how well your content performed among people who actually saw it, which makes it the better metric for judging email copy and design.
Do images help or hurt email CTR?
Images can help when they support the message, but many email clients block them by default, so your email must work without them. Always include alt text, keep the key message and call to action in real text, and test how the email looks with images off.
How often should I email my list?
As often as you have something worth sending. Consistency matters more than frequency: a useful monthly email beats a filler-heavy weekly one. Watch unsubscribes and engagement trends — they will tell you when you are overdoing it.
