Email remains one of the highest-return marketing channels available to UK businesses — but only when it is done well. The average inbox is a battlefield, and "send more emails" is not a strategy. These six tips focus on the levers that actually move conversion rates: relevance, timing, trust and clarity. Each one is practical enough to implement this week.
Tip 1: Segment your list before you write a word
The single biggest conversion lever in email marketing is sending the right message to the right people. A new subscriber, a repeat buyer and a lapsed customer should never receive the same email. At minimum, split your list by behaviour: what people bought, what they browsed, how recently they engaged, and where they are in the buying cycle.
You do not need fifty segments to start. Three to five well-chosen ones — new subscribers, active customers, lapsed customers, high-value buyers — will outperform a single blast list dramatically. Every platform from Mailchimp upward supports this; the barrier is thinking time, not technology. If someone has not opened anything in six months, stop emailing them weekly and try a re-engagement sequence instead — or let them go. A smaller, engaged list beats a large, dead one on every metric that matters.
Tip 2: Write subject lines for humans, not algorithms
The subject line decides whether your email gets opened at all, and UK inboxes punish the tricks: excessive capitalisation, fake urgency ("FINAL WARNING"), and misleading "Re:" prefixes erode trust and train spam filters against you. What works is specificity and relevance. "Your winter tyres are ready for fitting" beats "Amazing deals inside!!!" because it tells one person something useful.
Keep subject lines under about 50 characters so they survive on mobile, front-load the important words, and test two variants whenever the send matters. Avoid spam-trigger phrases around free money and miracle cures. And remember the preview text — that grey snippet after the subject — which most marketers leave as "view in browser". Write it deliberately; it is free extra selling space.
Tip 3: Make the call to action impossible to miss
Every marketing email should have one job, and one primary call to action that does it. Emails with three competing buttons — shop now, read our blog, follow us on Instagram — convert worse than emails with one clear ask. Decide what success looks like before you design: a purchase, a booking, a reply, a download.
Make the button big enough to tap on a phone (most of your opens are mobile), repeat it once further down a longer email, and use action language: "Book your fitting", "Claim the discount", "See the new range". Vague buttons like "Click here" or "Learn more" consistently underperform specific ones. And check the landing page the button leads to — an email that converts brilliantly to a broken or irrelevant page converts to nothing.
Tip 4: Automate the emails that earn while you sleep
Broadcast campaigns get the attention, but automated sequences do the quiet heavy lifting. The essential automations for most businesses: a welcome series for new subscribers (three to five emails introducing what you do and why it matters), abandoned basket reminders for ecommerce, post-purchase follow-ups asking for reviews, and re-engagement sequences for lapsing customers.
Abandoned basket emails deserve special mention: they target people who were one step from buying, so their conversion rates dwarf ordinary campaigns. Send the first reminder within a few hours while intent is fresh, follow up once or twice more, and consider a small incentive on the final nudge. Post-purchase emails are the most underused automation of all — a customer who just bought from you is at peak trust, making it the ideal moment to request a review or suggest a complementary product.
Tip 5: Design for the phone first
Most email opens now happen on mobile, yet plenty of business emails are still designed on a desktop and merely tolerated on a phone. Single-column layouts, minimum 14px body text, buttons at least 44px tall, images that scale — these are basics, not advanced tactics. Test every important send on an actual phone, not just in the platform's preview pane.
Keep image weight down: heavy images load slowly on mobile data and get blocked by some clients anyway. Never put essential information — prices, dates, the offer itself — inside an image, because image-blocking means a blank box. And always include a plain-text version; it is a deliverability signal as well as an accessibility one.
Tip 6: Measure what matters and prune ruthlessly
Open rates are increasingly unreliable — Apple's privacy changes mean many opens are never recorded. Judge your emails on click-through rate, conversion rate, revenue per send, and unsubscribe rate instead. Track these per segment and per automation, not just as account-wide averages that hide problems.
Then act on what you see. Subject lines with consistently low engagement get rewritten. Segments that never convert get a re-engagement attempt and then get suppressed. Send frequency gets tuned per segment — your best customers may welcome weekly emails while marginal subscribers need monthly. Email marketing compounds: small improvements to each send, applied consistently, produce large gains over a year. If you want this handled as part of a wider programme, our digital marketing service includes email strategy alongside the channels it needs to work with.
FAQs
How often should we send marketing emails?
As often as you have something worth saying to each segment — which is the honest answer most guides dodge. For most UK SMEs, that means weekly or fortnightly for engaged segments and monthly for everyone else. Watch unsubscribe and complaint rates as you increase frequency: a rising unsubscribe rate is your list telling you to slow down. Consistency beats intensity; a good monthly email outperforms four forgettable weekly ones.
Do we need consent to send marketing emails in the UK?
Yes. The UK's data protection and electronic marketing rules (UK GDPR and PECR) generally require prior consent before you send marketing emails to individuals — with a limited soft opt-in exception for existing customers who bought something similar and were given a clear opt-out. Keep records of consent, honour unsubscribes promptly (within the required timeframe, and immediately in practice), and never buy email lists. Bought lists are both illegal in most cases and useless in all of them.
What is a good email conversion rate?
It varies enormously by industry, list quality and what counts as a conversion — which is why benchmark-hunting is mostly a distraction. A far more useful exercise is benchmarking against yourself: track your conversion rate per campaign type over time and improve it. If you are just starting, focus on getting the fundamentals above right; the numbers will follow. Our guide to content marketing automation covers how email fits into the wider nurture picture.
Should we use emojis in subject lines?
Sparingly, and only if it fits your brand. One relevant emoji can lift opens in B2C; in B2B it more often looks unprofessional. Test it with your own audience rather than following blanket advice — your list's behaviour is the only data that matters.
Text-only or designed emails — which converts better?
It depends on context. Designed templates suit ecommerce and visual brands; plain-text style emails often win for personal, relationship-driven sends because they feel like they came from a person. Many businesses use both: designed for campaigns, plain-text style for automations like welcome sequences. Test both with your audience.
Email done well is a profit centre; done badly it is a spam complaint waiting to happen. If you want an expert eye on your current setup, get a free consultation — we will audit what you are sending and tell you exactly where the conversions are leaking.
