Email Marketing Still Delivers: Understanding the Value of the Channel

Email has survived repeated predictions of its decline. Social platforms, messaging apps, short-form video and new advertising formats have changed how businesses reach audiences, but the inbox remains an important part of digital communication.

Email marketing combines direct access to an audience with relatively low distribution costs, detailed measurement and the ability to communicate throughout a customer relationship. It also gives organisations considerably more control over their audience than channels where visibility depends primarily on a third-party algorithm.

That does not mean every email campaign performs well. Results depend on list quality, relevance, timing, deliverability, consent and a clear understanding of what the campaign is supposed to achieve.

Key takeaways

• Email remains a valuable marketing channel because it provides direct, permission-based access to an audience.
• Industry research continues to report strong returns from email marketing, although ROI varies considerably between organisations and methods of attribution.
• Healthy email programmes depend on appropriate consent, useful content, segmentation, deliverability and consistent measurement.
• Clicks, conversions, revenue and other business outcomes are generally more useful measures than open rates alone.
• Automation can make email more timely and efficient, but triggers and schedules should reflect customer behaviour rather than arbitrary rules.
• Email lists are first-party assets, but delivery still depends on mailbox providers, sender reputation, privacy rules and recipients' willingness to continue hearing from the sender.
• Marketing email laws differ by jurisdiction. There is no single compliance checklist that applies everywhere.

What is email marketing today?

Email marketing is the use of email to communicate with customers, subscribers and prospective customers for marketing purposes.

Modern programmes usually combine scheduled campaigns — such as newsletters, product announcements and promotions — with automated messages triggered by events such as a subscription, purchase or period of inactivity.

Email also plays a useful role alongside other marketing channels. Search, advertising and social media may introduce someone to a business; email can maintain the relationship after that first contact.

This is one reason email remains valuable. A social follower can become difficult to reach when a platform changes its algorithm. An email subscriber can normally still be contacted directly, provided the sender has an appropriate basis for doing so and maintains good deliverability.

Email should therefore be considered a first-party marketing channel, rather than an entirely "owned" one. The organisation controls its subscriber data and campaigns to a much greater degree than it controls a social platform, but Gmail, Outlook, Apple and other mailbox providers still influence whether and how messages reach recipients.

Why email marketing still matters

The economics of email remain attractive because sending another message to an established subscriber base generally costs much less than purchasing another advertising impression or click.

Published ROI figures vary according to industry, methodology and attribution. Litmus, for example, reports an often-cited average of around $36 returned for every $1 spent on email marketing. Such figures should be treated as benchmarks rather than promises: the performance of an individual programme depends on its audience, products, margins, list quality and measurement method.

Litmus: Email Marketing ROI

Email also has characteristics that suit longer customer relationships. A message can be saved, searched or revisited later. This is particularly useful for B2B purchasing, subscriptions, considered purchases, educational content and products with repeat buying cycles.

Most importantly, email can serve different purposes at different stages of the relationship. The same channel can welcome a subscriber, explain a product, announce an offer, support a customer after purchase and encourage an appropriate renewal or repeat purchase.

A brief history of email marketing

The first networked email is generally dated to 1971. Commercial use followed later in the decade.

In 1978, Gary Thuerk of Digital Equipment Corporation sent a promotional message to several hundred ARPANET users. Thuerk later said that the campaign generated around $13 million in sales. It is frequently described as the first commercial mass email.

As internet access expanded during the 1990s, commercial email grew rapidly, along with unsolicited bulk email. Regulation followed.

The US CAN-SPAM Act established requirements for commercial email in 2003. Canada introduced CASL, a stricter framework for commercial electronic messages, in 2014. European and UK businesses operate under data-protection and electronic-communications rules that regulate how personal information and electronic marketing may be used.

Over the same period, email marketing evolved from mass broadcasting into a discipline involving segmentation, automation, responsive design, testing, analytics and lifecycle communication.

The main advantages of email marketing

Email's value comes from a combination of characteristics rather than one headline ROI figure.

Direct communication. A message is delivered to an individual inbox rather than placed in a public feed where visibility depends heavily on an algorithm.

Relatively low distribution costs. Once a permission-based list exists, sending campaigns can be economical compared with continuously purchasing advertising exposure.

Measurability. Clicks, conversions, purchases, subscriptions and other actions can be connected to campaigns through analytics and tracking parameters.

Portability. Subscriber data can normally be moved between email service providers, subject to legal and contractual requirements.

Testing. Subject lines, offers, creative treatments and calls to action can be compared systematically.

Lifecycle communication. Email can support the relationship before, during and after a purchase rather than serving only as an acquisition channel.

These advantages are strongest when the subscriber has a clear reason to receive the messages. A large but disengaged list is not necessarily more valuable than a smaller list of people who actively want the content.

Marketing emails and transactional emails

Not every business email serves the same purpose.

Marketing emails include newsletters, promotions, product announcements, nurture sequences, event invitations and re-engagement campaigns. Their purpose includes promoting products, services, content or the organisation itself.

Transactional or service emails are triggered primarily by an action or account requirement. Examples include receipts, shipping notifications, password resets and important account information.

The distinction matters. Service communications often have different legal and operational requirements from marketing messages. Adding promotional material to a transactional message may also affect how that communication is treated.

Businesses should therefore avoid assuming that a receipt, password reset or delivery notification is simply another opportunity for advertising.

Common types of marketing email

Different messages serve different stages of the customer relationship.

Welcome emails introduce new subscribers to the organisation, explain what they can expect and deliver anything promised during signup.

Newsletters maintain regular contact through news, useful information, editorial content or product updates.

Promotional emails communicate offers, launches and seasonal campaigns.

Nurture sequences provide information over time to people considering a product or service, particularly where the buying decision takes longer.

Post-purchase marketing can provide useful product information, request feedback or introduce relevant complementary products where appropriate.

Retention and re-engagement campaigns attempt to maintain relationships with existing customers or determine whether inactive subscribers still want to receive messages.

The right mix depends on the business. A weekly publication, an online retailer and a B2B software company should not have identical email programmes.

Start with the audience, not the software

Choosing an email platform is not the first strategic decision. The starting point is understanding who should receive the messages and why.

Segmentation can use information such as customer status, declared interests, purchase behaviour and previous engagement. More detailed programmes may also use location, browsing behaviour or other customer information.

Any personal information used for segmentation should be lawfully collected, relevant to the purpose and handled in accordance with applicable privacy rules. The fact that data can technically be collected does not automatically mean it should be used for marketing.

A useful segmentation system might distinguish between:

The purpose is relevance, not segmentation for its own sake.

Planning an email marketing strategy

A useful email strategy connects messages to business objectives.

"Increasing engagement" is too vague to guide a campaign. A more useful objective might be increasing repeat purchases, generating qualified enquiries, renewing subscriptions or bringing readers back to editorial content.

From there, determine which email activities can realistically contribute.

Product launches may require a short campaign. New subscribers may benefit from a welcome sequence. A subscription service may need onboarding and renewal communication. A publication may rely primarily on a recurring newsletter.

Email should also be coordinated with other channels where useful. A major report, product launch or event may involve search, social, advertising and email, but there is no rule that every piece of content must be promoted through every channel on the same day.

The campaign objective and audience should determine the timing.

Building a healthy email list

A useful email list is built from people who have an appropriate reason to receive the messages.

Signup opportunities may include website forms, newsletter subscriptions, event registrations, content downloads and appropriately designed checkout options.

The value exchange should be clear. A person should understand what they are signing up for and what they can expect to receive.

Buying email lists is generally a poor foundation for an email programme. Apart from the legal questions involved, purchased contacts often have little relationship with the sender and can generate low engagement, complaints and deliverability problems.

Double opt-in adds a confirmation step after signup. It can reduce incorrect addresses and provide stronger evidence that the person controlling an address intended to subscribe.

It is not, however, a universal legal requirement. Whether consent is required, and what form it must take, depends on the jurisdiction, recipient and circumstances.

Whatever signup method is used, expectations should be clear. Tell subscribers what kind of communication they will receive and avoid disguising marketing consent inside unrelated terms.

Segmentation and personalisation

Segmentation is useful when it makes messages more relevant.

Simple distinctions can be effective:

• new subscribers versus established customers;
• active versus inactive customers;
• product categories previously purchased;
• interests selected by the subscriber;
• stage in the customer lifecycle.

Personalisation does not have to mean inserting someone's first name into the subject line.

A more meaningful form of personalisation is choosing content based on information the subscriber has provided or on an appropriate understanding of the relationship. A customer who bought a camera may find information about using that camera more relevant than a generic catalogue of unrelated products.

Dynamic content can also vary parts of an email for different segments while preserving the same overall design.

The objective should be usefulness. Increasing the amount of personal data used does not automatically improve the message.

Writing effective subject lines and email content

There is no universal ideal length for a subject line.

Different email clients display different amounts of text, particularly on smaller screens. Put important information early, make the subject accurately represent the message and avoid misleading attempts to manufacture urgency or curiosity.

The old idea that a handful of "spam words" automatically sends an email to the junk folder is also too simplistic. Modern filtering systems consider many signals, including sender reputation, authentication, recipient behaviour and message characteristics.

A useful subject line should therefore concentrate on clarity and relevance rather than trying to outsmart a spam-word checklist.

Preheader text can complement the subject rather than repeat it.

Inside the email, make the hierarchy obvious. Readers should be able to understand quickly why the message matters and what, if anything, they are being asked to do.

Calls to action should be easy to identify, but there is no universal requirement to place one "above the fold." Screen sizes and email clients vary too widely for a consistent fold to exist.

Email design and accessibility

Email should work on small screens as well as desktop clients.

Simple layouts often adapt more reliably than highly complex ones. Buttons and links should be easy to activate, text should remain readable without zooming, and important information should not depend entirely on images.

Accessibility should be part of the design rather than an afterthought.

Use descriptive alternative text where an image conveys information. Maintain a logical heading structure. Provide sufficient colour contrast. Use meaningful link text rather than repeated "click here" links. Do not place essential text exclusively inside graphics.

Email clients also render HTML differently. Test important templates in representative clients such as Gmail, Outlook and Apple Mail rather than assuming that a design that works in one will work identically everywhere.

Using email automation

Automation allows messages to respond to events rather than requiring every email to be sent manually.

Typical examples include:

• a welcome sequence after subscription;
• information following a purchase;
• a reminder related to an unfinished process where sending one is appropriate;
• a renewal notice;
• a re-engagement sequence after a meaningful period of inactivity.

Automation timings should be treated as hypotheses to test, not universal formulas.

An abandoned-cart reminder after one hour may work for one retailer and be intrusive for another. A 60-day definition of inactivity may make sense for a weekly service but be meaningless for a product customers normally buy once a year.

Automation works best when it responds to the actual customer lifecycle.

It also requires safeguards. Automated messages can become inappropriate when circumstances change, data is wrong or multiple workflows overlap. Frequency limits, suppression rules and regular reviews are therefore part of a good automation system.

Measuring email marketing performance

Metrics can be grouped into three useful categories.

Open rates deserve particular caution.

Privacy features such as Apple Mail Privacy Protection can register activity that does not correspond directly to a person opening and reading a message. Open data can still provide some directional information, particularly when comparing similar campaigns within the same programme, but it should not be treated as a precise measure of human attention.

Click-to-open rate inherits the same limitation because its denominator depends on measured opens.

Clicks and conversions generally provide stronger evidence of action. For commercial programmes, measures such as revenue per recipient, repeat purchases or qualified enquiries may be more useful still.

UTM parameters and analytics systems can connect email activity with website behaviour, although attribution is never perfect.

The most useful benchmark is often the programme's own historical performance under comparable conditions rather than a universal industry average.

Deliverability: reaching the inbox

A campaign has little value if messages consistently land in spam folders or are rejected.

Deliverability depends on multiple factors, including sender reputation, authentication, list quality, complaint levels and recipient engagement.

Technical authentication should include appropriate use of SPF, DKIM and DMARC. These mechanisms help receiving systems determine whether messages claiming to come from a domain are authorised and how failures should be handled.

Authentication alone does not guarantee inbox placement. List acquisition practices, sending patterns, complaints and the relevance of messages also matter.

List hygiene should not rely solely on recorded opens because open tracking is imperfect. Where possible, assess inactivity using several signals: clicks, purchases, account activity, replies and the time since the recipient last demonstrated meaningful engagement.

Hard bounces should be handled promptly, and recipients who unsubscribe must be suppressed from future marketing as required.

Email marketing law and consent

There is no single worldwide set of email marketing rules.

Requirements depend on the sender's and recipient's jurisdictions, whether the recipient is an individual or organisation, the nature of the message and the existing relationship between the parties.

United States

The CAN-SPAM Act regulates commercial email in the United States. Among other requirements, commercial messages must use accurate sender information, avoid deceptive subject lines, provide a valid physical postal address and offer a mechanism for opting out.

US Federal Trade Commission: CAN-SPAM compliance guidance

United Kingdom

UK email marketing is governed principally by the Privacy and Electronic Communications Regulations (PECR), alongside data-protection requirements where personal information is involved.

Unsolicited electronic marketing to individual subscribers normally requires consent unless the conditions of an applicable soft opt-in are satisfied. Different rules apply to corporate subscribers.

The familiar products-and-services soft opt-in can apply where an organisation obtained contact details directly during a sale or negotiations for a sale, markets its own similar products or services, and provided an opportunity to opt out both when collecting the details and in subsequent communications.

The Data (Use and Access) Act 2025 also introduced a separate charitable-purposes soft opt-in, which came into force in February 2026 under defined conditions.

Information Commissioner's Office: guidance on direct marketing using electronic mail

European Union

Organisations operating in the EU need to consider the applicable national implementation of electronic communications rules alongside the GDPR where personal data is processed.

The exact requirements should be checked for the jurisdictions involved rather than assuming that one country's implementation applies throughout Europe in precisely the same way.

Canada

Canada's Anti-Spam Legislation (CASL) generally requires consent, identification information and an unsubscribe mechanism for commercial electronic messages.

Importantly, CASL recognises both express and implied consent under defined circumstances; it is inaccurate to describe the law simply as requiring explicit opt-in in every case.

CRTC: guidance on consent under Canada's Anti-Spam Legislation

Businesses operating across borders should identify which rules apply to their particular circumstances rather than relying on a generic global compliance checklist.

Choosing email marketing software

The best email platform is not necessarily the one with the longest feature list.

Most organisations need some combination of:

• reliable campaign sending;
• template creation;
• subscriber and consent management;
• segmentation;
• automation;
• analytics;
• integrations with websites, ecommerce platforms or CRM systems;
• deliverability and authentication support.

More sophisticated platforms may add dynamic content, predictive tools, complex journey builders and AI-assisted features.

Choose according to the current programme rather than an imagined future one. A small newsletter may need little more than dependable sending and subscriber management. An ecommerce operation with thousands of products and behavioural campaigns may need much deeper integration.

Switching platforms is possible, so there is little benefit in paying for complexity that the organisation does not yet use.

Subscriber fatigue and list decay

Email programmes change as their audiences change.

People lose interest, change jobs, abandon addresses or simply decide they no longer need a product. This natural list decay is not necessarily evidence that the programme has failed.

Problems arise when organisations continue increasing frequency or repeating the same content despite declining interest.

Watch for patterns in clicks, conversions, unsubscribes, complaints and other relevant behaviour. Preference centres can also allow subscribers to choose topics or frequency rather than forcing a choice between receiving everything and unsubscribing completely.

Re-engagement campaigns can help determine whether inactive subscribers still want the messages, but they should not become an excuse to contact disengaged people indefinitely.

A smaller responsive list can be considerably more useful than a large database of people who no longer want to hear from the sender.

Email as part of a broader marketing strategy

Email works best as part of a relationship rather than as an isolated broadcasting system.

Search, advertising, events, social media and content can attract attention. Email can then maintain contact with people who have chosen to continue that relationship.

The reverse is also true. A newsletter can send readers back to useful website content. A product email can support a broader launch. Event attendees can receive appropriate follow-up information. Existing customers can receive relevant education and renewal communication.

Not every campaign needs every channel. The objective is coordination where it improves the customer experience, not omnichannel activity for its own sake.

This is where email's durability matters most. Platforms and formats will continue to change, but organisations still need a reliable way to communicate directly with people who have chosen to hear from them.

Frequently asked questions

How much does email marketing cost?

Costs vary widely.

A small list with simple newsletters may fit within a free or inexpensive service. Costs usually rise with subscriber numbers, sending volume, automation complexity and additional services.

Instead of choosing a platform according to an arbitrary monthly budget, calculate what functionality the programme actually requires and how its cost compares with the value the channel generates.

How often should marketing emails be sent?

There is no universal ideal frequency.

A daily news publication and a company selling high-value equipment have completely different relationships with their audiences.

Set expectations during signup, monitor engagement and complaints, and adjust frequency according to the type of content and audience. Where appropriate, allow subscribers to choose their preferred frequency.

What is a good email open rate?

There is no single useful benchmark for every organisation.

Reported open rates vary according to industry, message type, audience, provider and measurement method. Privacy features have also made recorded opens less reliable as a measure of actual readership.

Compare similar campaigns within your own programme and place greater emphasis on clicks, conversions and business outcomes when those are available.

Can AI manage email marketing automatically?

AI can assist with tasks such as drafting copy, producing variations, analysing data and suggesting subject lines.

It does not remove the need for decisions about strategy, audience, consent, brand voice, accuracy or appropriateness.

Automating more work is not necessarily the same as improving the programme. AI-generated content and recommendations still require appropriate human review.

How quickly does email marketing produce results?

Some results can appear quickly. A useful welcome email or well-targeted promotion may produce measurable activity immediately.

Building a mature programme takes longer. List growth, segmentation, automation, testing and customer lifecycle data improve over time.

Rather than setting an arbitrary date by which email "should work," establish milestones that correspond to the programme: build a healthy list, implement essential journeys, establish reliable measurement, then use accumulated data to improve subsequent campaigns.

Email still delivers — when there is a reason to open it

Email's longevity does not come from a particular subject-line formula, automation platform or industry ROI statistic.

Its enduring advantage is simpler: it provides a direct way to maintain a relationship with people who have chosen, or where applicable are otherwise lawfully eligible, to receive communication from an organisation.

That access should not be taken for granted.

Successful email marketing depends on earning continued attention with useful, relevant communication; respecting consent and preferences; maintaining good technical delivery; and measuring outcomes that actually matter to the organisation.

Used in that way, email is neither an old-fashioned channel nor a guaranteed source of easy returns. It is a mature marketing tool whose value comes from the quality of the relationship behind every address on the list.

Email Marketing