Definition
Email marketing is the practice of sending commercial messages to a targeted list of recipients via email. It is one of the most direct, cost-effective and measurable marketing channels available, used to nurture relationships, drive conversions, announce products and retain customers.
Unlike social media or paid ads, where your message appears inside a crowded feed controlled by an algorithm, email goes directly to a person who has opted in to hear from you. This permission-based foundation makes email highly effective: subscribers have already signaled interest, so campaigns typically earn far more per dollar than many other channels.
Email marketing spans everything from a simple weekly newsletter to complex automated journeys that send the right message at the right time based on behavior, preferences and lifecycle stage.
Why It Matters
This matters because the choices you make here show up directly in your results. Email marketing spans everything from a simple weekly newsletter to complex automated journeys that send the right message at the right time based on behavior, preferences and lifecycle stage. When this is handled well it supports engagement, delivery, and the trust subscribers place in your brand; when it is neglected, the effects tend to show up in declining performance and harder-to-fix problems further down the line.
Best Practices
- Start with the fundamentals of What is Email Marketing and build from a clear baseline, so later improvements are measurable rather than assumed.
- Keep What is Email Marketing consistent with how the rest of your email programme works, so no single initiative works against another.
- Review how What is Email Marketing is handled in your own data and adjust from what you see, rather than copying what another brand does.
- Test one change at a time and measure the effect before rolling it out more widely.
- Revisit your approach to What is Email Marketing regularly, because audience behaviour and inbox technology keep moving.
- Make sure the basics — relevance, timing, and honesty — are solid before chasing more advanced tactics.
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Related Glossary Terms
A/B Testing
A/B testing in email marketing is the practice of sending two variations of an email to a small sample of your list to determine which version performs better before sending the winner to the remaining subscribers.
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
Account-Based Marketing Email
An account-based marketing email is a highly targeted message sent to a specific organisation or decision-maker group as part of a focused B2B strategy.
AI Email Summary
An AI email summary is a short, machine-generated overview of an email's key points, shown by Gmail, Outlook and Apple Mail before a recipient opens the message. It is reshaping how email marketers think about subject lines, preview text and open rates.
AI Inbox Summary
An AI inbox summary is an AI-generated digest that condenses unread email — often highlighting news, actions and senders — changing how clearly your marketing email reaches and engages subscribers.
AI Inbox
An AI inbox is an email client that uses artificial intelligence to summarise, sort, prioritise and sometimes answer emails before the human recipient reads them. It is transforming email marketing metrics and copywriting.
Frequently Asked Questions
Email marketing is used to nurture leads, drive sales, announce launches, share content, recover abandoned carts, retain customers and deepen brand relationships over time.
Yes. Email consistently returns among the highest ROI of any digital channel, often $36-$42 for every $1 spent, because it reaches an opted-in audience directly and is highly measurable.
No. A small, engaged list outperforms a large, purchased one. Focus on quality subscribers who open and click rather than chasing raw list size.