What is Email Marketing? Definition, Types, and best Practices (2026)

Short on time? Here's the quick version before we dig into the detail:

• What it is: email marketing sends targeted, permission-based messages to promote products, share content, and nurture customer relationships.
• Why it works: in our latest research, 93% of people surveyed named email as their primary digital marketing channel for engaging with companies.
• The return: industry data puts the average ROI at around £29 for every £1 spent, climbing higher for retail and e-commerce.
• The seven core email types: newsletters, promotional, relational, transactional, lead nurturing, confirmation, and interactive emails.
• Staying compliant: in the UK, you must follow GDPR and the Privacy and Electronic Communications Regulations (PECR), which govern consent, opt-in, and the right to unsubscribe.
• The modern edge: automation and AI now handle segmentation, send-time optimisation, and personalisation at a scale manual methods can't match.

• Email marketing explained 
• What is an email marketing strategy? 
• Email marketing best practices 
• UK email marketing law: GDPR and PECR 
• How to build an email list 
• What are the costs involved? 
• What are the different types of marketing emails? 
• How to get started with email marketing 
• Common email marketing mistakes to avoid 
• How AI and automation are changing email 
• Advantages and disadvantages 
• Choosing email marketing software 
• Email marketing tips
• Frequently asked questions 

Email marketing is the practice of sending commercial messages to a group of subscribers who have agreed to hear from you, with the aim of building relationships, driving conversions, and growing revenue. 

Companies have plenty of ways to connect with customers now, but it's still hard to beat a well written, well-timed email. In our latest research, 93% of people surveyed said that email was their primary digital marketing channel for engaging with companies. Competition for attention and clicks is at a premium, so your email marketing strategy needs to constantly evolve to keep up. 

Email has come a long way since the first marketing message was sent in 1978. What began as a broadcast tool for mass mailings has become a precise, data-led channel — one where every message can be tailored to the individual reader. Yet many companies still lean on generic tactics that haven't been relevant in years, leading to disinterested customers hunting for the unsubscribe button. If your metrics are suffering and you're not seeing the results you need, it may be time to review your approach and see where you can improve. 

In this article, we'll cover the fundamentals of email marketing and show you how cloud solutions, automation, and AI can sharpen your approach. You'll learn how to create and send memorable emails for your customers and prospects, step by step. 

An email marketing strategy is your plan for what to send, who to send it to, and when - designed to give customers valuable information that helps them make smarter purchasing decisions. 

Simple, straightforward messages position your company as helpful rather than invasive or 'salesy'. As the email campaign journey advances, an authentic sense of trust develops between your brand and your customers. Email marketing helps you drive conversions and revenue by delivering quality information that helps your customers achieve their goals.

As the quality and speed of digital experiences exploded with the rise of social media and mobile apps, marketers began turning to tools like AI and automation to deliver better messages at the right moment. 

Email rarely works in isolation, so it helps to understand where it sits in the wider marketing mix:

• Email vs. social media: social platforms are excellent for discovery and brand awareness, but you don't own your audience there — an algorithm change can wipe out your reach overnight. Your email list is an asset you own outright.
• Email vs. SMS: SMS wins on immediacy and open rates for short, time-sensitive alerts, but it offers little room for rich content or storytelling. Email gives you space to design, explain, and persuade.
• Working together: the strongest programmes combine all three, using email for depth and nurture, SMS for urgency, and social for reach.

The best email marketing programmes are built on a foundation of segmentation, personalisation, and automation - then refined continually using performance data. 

Is email marketing easy? The short answer is that yes, it can be, if you set it up properly. Optimising your email marketing campaigns takes time, but starting with a personalised strategy and using tools like marketing automation and AI keeps the process manageable. It's all about laying a foundation, listening to the data, and making adjustments as you go. 

Segmentation and personalisation let you reach individual customers with highly targeted content that's meaningful to them. That means they're more likely to engage with the emails and, in turn, your brand. 

Here's a closer look at some best practices for email marketing: 

1. Craft marketing emails that people will engage with

Emails are an art and a science, and efficiency is the difference-maker. It's important not only to get into the inbox but also to earn engagement once you're there. From eye-catching subject lines to the power of dynamic content, email marketing is equal parts what you say and how you say it.

2. Write subject lines that earn the open

Your subject line is the gatekeeper: no open, no engagement. Keep it short (aim for under 50 characters so it doesn't truncate on mobile), lead with value or curiosity, personalise where you can, and avoid spam-trigger words like 'free', 'guarantee', and excessive punctuation. A/B testing two variations is the fastest way to learn what your audience responds to. 

3. Follow legal compliance guidelines

Adhering to the laws and guidelines around email communications keeps you out of trouble, out of spam filters, and into customers' inboxes. Following data protection and anti-spam standards helps you protect the safety, security, and privacy of the emails you send and receive. It's also simply good business not to spam potential customers or invade their privacy in any way. 

4. Improve email deliverability

With so much automation involved, make sure your connections are linked properly and all information is entered correctly to ensure deliverability. Don't let your emails get lost in cyberspace. Authenticate your sending domain with SPF, DKIM, and DMARC records, keep your list clean, and take steps to ensure your messages don't bounce back or wind up in spam filters by researching what works best for your industry. 

5. Acquire new subscribers

Email marketing is about reaching more people and building campaigns that scale. There are many ways to build your email list, but the first step is to ask. Invite people to subscribe to your newsletter, share your content, or simply stay opted in. Make sure you activate your outreach channels, online and in person. 

6. Engage your subscribers

Acquiring subscribers is just the start. Opt-in incentives, coupons and offers, curated content, and personalised messaging are all proven ways to keep subscribers engaged. Craft an engaging drip campaign that keeps potential customers coming back for more by providing genuine value and connection. 

7. Measure the right KPIs

You can't improve what you don't measure. Track these core metrics for every campaign: 

Open rate: the percentage of recipients who opened your email - a signal of subject-line and sender strength.

Click-through rate (CTR): the percentage who clicked a link, showing how compelling your content and calls to action are. 

Conversion rate: the percentage who completed the desired action, such as a purchase or sign-up. 

Bounce rate: the percentage of emails that couldn't be delivered, which points to list quality issues. 

Unsubscribe rate: a rising figure is an early warning that your content or frequency needs a rethink. 

In the UK, email marketing is governed by two frameworks: the UK GDPR and the Privacy and Electronic Communications Regulations (PECR). Together they set the rules for how you collect consent, contact people, and handle their data.

Getting this right isn't just about avoiding fines from the Information Commissioner's Office (ICO) — it builds the trust that underpins every successful programme. Here's what UK marketers need to know:

• Consent and opt-in: under PECR, you generally need clear, informed consent before sending marketing emails to individuals. Pre-ticked boxes don't count; consent must be an active choice.
• The 'soft opt-in': you may email existing customers about similar products or services if you collected their details during a sale and gave them a chance to opt out — provided you offer that choice in every message.
• Right to unsubscribe: every marketing email must include a clear, working unsubscribe link, and you must action opt-out requests promptly.
• Data handling under GDPR: you must store contact data securely, use it only for the purposes people agreed to, and be ready to honour requests to access or delete it.
• Record-keeping: keep evidence of when and how each subscriber gave consent, so you can demonstrate compliance if asked.

A quick methodology note on the figure we cited earlier: the '93% prefer email' statistic comes from Salesforce's State of the Connected Customer research, based on a global survey of thousands of consumers and business buyers. 

The best email list is one you've grown organically, with the explicit permission of every subscriber. Buying lists breaches PECR, damages deliverability, and erodes trust - so it's always worth doing this the right way.

The most effective tactic is to offer something of value in exchange for an email address, known as a lead magnet. Consider these proven approaches:

• Lead magnets: offer a free guide, template, checklist, or discount code in return for a sign up.
• Website sign-up forms: place clear, benefit-led forms on high-traffic pages, your blog, and your footer.
• Gated content: ask for an email address to access premium resources such as webinars or research reports.
• In-person and events: collect opt-ins at trade shows, in-store, or at events, always with a clear explanation of what people are signing up for.
• Social and paid channels: run lead-generation campaigns that direct interested people to a sign-up form.

Whatever the method, always be transparent about what subscribers will receive and how often - it sets expectations and keeps your list healthy.

Email marketing is one of the most affordable channels available, and it consistently delivers one of the highest returns in digital marketing - an average of around £29 for every £1 spent. 

The exact cost depends on the size of your business, the size of your audience, and how many emails you send each month. Those costs will fluctuate as you move through busy seasons, launch new products, and grow your list. 

That said, the good news is twofold: 

• Low barrier to entry: it doesn't have to cost much to get started, especially if you run things in-house. Hiring an email marketing agency costs roughly £300 to £480 a month for a small business, and anywhere from £1,600 to £9,500 for large businesses.
• Strong returns: industry experts put the ROI of email marketing at around £29 for every £1 spent on average, according to Litmus. That figure climbs even higher in sectors like retail and e-commerce.

Email marketing cost considerations

When budgeting, break your costs into two main buckets - technology and labour:

1. Technology costs include your email marketing software, email service provider, and internet service provider.

2. Labour costs include email design, copywriting, and campaign management.

Depending on the size of your business and the complexity of your needs, you may be able to absorb some of these costs into existing budget lines. Most businesses already pay for internet and email services, and if you have graphic designers in-house, you likely already own the software needed to design campaign visuals. The takeaway is clear: the ROI for email marketing more than justifies the outlay.

There are seven main types of marketing email - newsletters, promotional, relational, transactional, lead nurturing, confirmation, and interactive - each serving a distinct purpose in your campaigns. 

Experts often start with four core categories, but modern programmes use all seven. Organising your emails this way makes it far easier to plan campaigns and map them to the customer journey. 

Pro tip: track every email you send so you can improve continually. Let's dig in. 

• Definition: a recurring email sent to subscribers to keep them informed about the latest news and updates about your product or brand.
• Best used for: building relationships, staying top of mind, and nurturing loyalty over time.
• Example: a weekly digest mixing thought leadership, how-tos, and product announcements.
• Key stat: 31% of marketers say email newsletters are the best way to nurture B2B leads.
• Depending on your industry, you can send newsletters weekly or monthly. Their benefits include building and strengthening subscriber relationships, increasing brand engagement, maintaining retention, and building loyalty.

• Definition: direct offers sent to your list, from discounted pricing to new product announcements and webinar invitations.
• Best used for: driving immediate sales and conversions.
• Example: a seasonal sale announcement with a time-limited discount code.
• Key stat: email accounted for 19.8% of all transactions, trailing only paid search (19.9%) and organic traffic (21.8%) among digital channels, according to Barilliance.
• It's no wonder promotional emails are so popular - they work.

• Definition: emails designed to build relationships by adding value upfront through free content and information.
• Best used for: deepening connection with prospects and existing customers. Example: a subscriber welcome email, a helpful blog round-up, or a customer survey.
• Key stat: welcome emails generate up to 4x the open rate and 5x the click rate of standard promotional emails.

The more engaging you make these emails, the stronger the connection you'll build. Newsletters are often categorised as relational emails, though we think they're significant enough to warrant their own category.

• Definition: an email triggered by a commercial transaction or specific action, such as a purchase confirmation, subscribe click, or password reset.
• Best used for: furthering the customer along their journey with the brand. Example: an order receipt or a shipping notification.
• Key stat: transactional emails see far higher open rates than marketing emails because recipients actively expect them.
• Each transactional email prompts the recipient to take action, and personalisation is important here because it responds to a specific action they've taken to connect with you.

• Definition: targeted communications sent to potential customers who have shown interest but aren't ready to buy.
• Best used for: building trust and moving leads through the sales funnel at their own pace.
• Example: a multi-email sequence that educates a prospect after they download a resource.
• Key stat: nurtured leads tend to make larger purchases than non-nurtured leads.

This strategic approach keeps your company top of mind, addresses concerns, and guides prospects towards conversion, forming a key part of an effective inbound marketing strategy.

• Definition: automated messages that verify the successful completion of an action, such as a purchase, registration, or booking.
• Best used for: reassuring users and providing a record of their action.
• Example: a booking confirmation with reference details.
• Key stat: clear confirmations reduce customer-service queries by giving people the reassurance and reference they need.

These emails typically include the details of the transaction, building trust by confirming the request has been processed and serving as a reference for future interactions.

• Definition: emails with web-like functionality that let recipients take action within the inbox itself.
• Best used for: boosting engagement by giving customers something to do.
• Example: adding an item to a cart, booking a hotel room, or watching a video without leaving the email.
• Key stat: interactive content consistently lifts engagement compared with static emails.

By using interactive emails, you can even update content after it's been sent, and include form fills - software that automatically populates fields in the user interface - within the body of the email.

Beyond the core seven, several situational emails deserve a place in your calendar:

• Welcome emails: the first message a new subscriber receives, setting the tone for the relationship.
• Dedicated and segmented campaigns: a single message sent to a specific segment for a focused purpose.
• Invitation emails: invites to a webinar, event, or product launch.
• Survey emails: requests for feedback that show you value the customer's opinion.
• Seasonal and holiday emails: timely campaigns tied to key dates such as Black Friday, Christmas, or the January sales.

Now that we’ve covered the different types of email campaigns you can launch, here’s how you can start an email marketing programme in your company.

1. Know your business goals for email marketing

First things first: Define your business goals. Knowing what you need to accomplish with your emails will help you hone in on the email marketing tools and features you need in an email marketing software solution.

2. Know what emails to send

Now that you know the different types, you can decide what is best for your brand. From newsletters to interactive, transactional messages, there are multiple kinds of marketing emails you can send. Make sure the tool you consider supports the easy design, distribution, and analytics tracking of your preferred formats.

3. Know what connects emails to customer data

Data is the gateway to scalability. Choosing an email marketing tool that integrates with your customer data system makes it easier to send emails with dynamic content, run automated drip-and-nurture campaigns, and so much more. Email tools that integrate with CRM systems, and understand your email benchmarks and metrics like open rates, click-through rates, and more open the door to advanced functionality and scalability.

4. Know what integrates email marketing to your business tools

Once you start growing subscriber lists and collecting analytics data on campaign performance, you'll want to share that information across your organisation. Team collaboration is key to scaling your email marketing campaign to new heights.

5. Know what tools your employees can use easily

The best email marketing tool in the world won't do your business much good if it's too complicated to use. Look for a tool that's user-friendly and supported by solid documentation and support. Find a tool that offers a host of self-service support options to help you find the answers you need, on demand.

Once your foundations are in place, an automated drip campaign is a natural next step. Here's a simple welcome flow to model:

1. Email 1 (immediate): a warm welcome that delivers the promised lead magnet and sets expectations.

2. Email 2 (day 2): share your best content or a helpful how-to that builds credibility. 3. Email 3 (day 5): introduce your product or service in the context of a problem it solves.

4. Email 4 (day 8): a gentle offer or call to action, such as a demo or a first-purchase discount.

Each step should add value before it asks for anything in return.

Most email marketing problems trace back to a handful of avoidable errors. Sidestep these and you'll be ahead of most senders:

• Buying email lists: it breaches PECR, harms deliverability, and rarely produces genuine engagement.
• Skipping segmentation: sending the same message to everyone leads to irrelevance and unsubscribes.
• Neglecting mobile: the majority of emails are opened on phones, so a design that breaks on mobile costs you conversions.
• Weak or missing calls to action: if readers don't know what to do next, they'll do nothing.
• Emailing too often (or too rarely): the wrong cadence either fatigues your audience or lets them forget you.
• Ignoring the data: failing to review open, click, and unsubscribe rates means repeating mistakes campaign after campaign.
• Forgetting to test: sending without A/B testing or a preview check risks broken links and formatting issues reaching your whole list.

Automation and AI have transformed email from a broadcast tool into a personalised, one-to one channel - handling segmentation, send-time optimisation, and content generation at a scale no manual process could match. 

Email is one of the top channels being reshaped by AI. Customers now expect businesses to send personalised messages and offers, and marketers need technology to meet those demands. 

According to Salesforce's tenth edition State of Marketing report, 83% of marketers agree customers want two-way conversations with businesses in email and text messages. High performing teams are 1.5x more likely to reply to customers frequently via email and text than underperformers. Even so, 69% of marketers say they struggle to deliver the immediate, two way engagement customers expect. 

Marketing automation has helped businesses move away from generic messages sent to lengthy subscriber lists and get more personal. Richer data collection and management make it

possible for emails to focus on the specific wants and needs of each customer - and that email personalisation is genuinely powerful. 

You can use AI within marketing automation platforms to extend their capabilities and deliver more targeted, personalised experiences. 

Where marketing automation in email focuses on automating workflows, nurturing leads, and managing campaigns, AI uses advanced algorithms and machine learning to analyse data and make data-driven decisions. It sharpens personalisation, optimises subject lines, generates dynamic content, pinpoints optimal send times, and provides predictive analytics. 

Together, marketing automation and email marketing AI produce highly targeted, effective campaigns. 

"Email remains the workhorse of digital marketing, but the winners are those pairing it with data and AI. Personalisation at scale is no longer a nice-to-have - it's what customers now expect from every message they receive." 

Effective email marketing wouldn't be possible without marketing automation platforms. A platform helps you scale lead management - coordinating campaigns and nurturing and scoring leads to gauge engagement. 

Marketing automation is the engine that makes segmentation and personalisation possible at scale. Today's platforms let you segment audiences by identifiers such as age, location, interests, and purchase history. Unlike email blasts, this personalised approach means customers receive relevant, targeted messages - and businesses see higher engagement and more conversions as a result. 

This is especially true when your audience has opted in to your outreach, which simply means they're interested in your business and what you offer. That gives your brand an opportunity to build trust, form stronger relationships, and deliver better experiences. 

One of the biggest benefits of email marketing is the ability to personalise messaging. Email personalisation can take many forms, from using a recipient's first name to recommending products based on purchase history - and the capabilities are advancing quickly. 

AI analyses vast amounts of data to deliver tailored, relevant content to individual recipients. By identifying patterns, trends, and behaviours, marketers can serve highly relevant content that

lifts engagement, improves open and click-through rates, and ultimately drives better conversion and customer satisfaction. 

With a flexible, customisable strategy, you can achieve a range of marketing and sales goals, including:

• Building customer relationships
• Boosting brand awareness
• Generating and nurturing leads
• Marketing products and services
• Promoting content and useful resources

The best email marketing software lets you run campaigns from start to finish - designing, sending, and analysing - so each campaign improves on the last. When comparing tools, weigh features, pricing tiers, and which type of business each is built for. 

The best email marketing platforms give you the power to handle everything: 

• Writing copy and designing templates for email messages
• Creating dynamic, personalised content to wow your audience
• Acquiring subscribers and managing leads with CRM integration
• Segmenting leads and running personalised drip-and-nurture campaigns
• Tracking analytics and optimising campaigns as they run

It's worth noting that Salesforce has been named a Leader in the Gartner® Magic QuadrantTM

for Multichannel Marketing Hubs for the eighth year running — recognition that reflects both

product strength and vision.

Here are some quick wins for email marketing success:

• Get personal: personalise your email campaigns for different segments. 
• It's not all about promos: make relational emails a priority.
• Automate: make automation a hallmark of your programme.
• Test everything: run A/B tests to discover the best send times and subject lines. Updates: share product updates to keep people in the loop.
• Make it mobile-friendly: optimise every email campaign for mobile.
• Evaluate: track your performance and adjust over time.
• Be consistent: maintain a consistent brand voice throughout.
• Provide value: offer incentives to improve engagement.
• CTA: make your call to action clear.
• Lead magnets: create lead magnets to bring new subscribers on board.

There’s a lot to consider when starting your email marketing campaign. Between sending at the right time, creating compelling content and keeping compliant, there’s plenty to get right.

When your email marketing efforts succeed, there’s no better way to convert leads, cultivate brand loyalty, and grow your business.

Are you looking for an email marketing solution? Learn more about how Marketing Cloud for email marketing.