What is email marketing?
Email marketing is sending useful, targeted emails to people who've given you permission to contact them. It's how businesses welcome new subscribers, follow up with leads, bring back past customers and announce offers. This guide covers the email marketing fundamentals: building a list, reaching the inbox, writing emails people open, automating the repeat work and staying legal.
Why email still matters
- You own the list: social platforms can change their algorithm or close your account. Your subscriber list stays yours.
- It reaches people who asked: subscribers chose to hear from you, so they're warmer than a cold audience.
- It runs on its own: automated flows send the right email when someone signs up, buys or goes quiet.
- It's measurable: you can see clicks, conversions and revenue for every send.
- It's cheap to test: a subject line test costs nothing but a few minutes.
How to build your email marketing program
Step 1: Build a list with permission
Only email people who asked to hear from you. Ways to grow a list ethically:
- A signup form on your homepage, blog and footer
- A useful lead magnet: a checklist, template, guide or first-order discount
- An opt-in checkbox at checkout (unchecked by default)
- Signups at events, with a clear note of what they'll receive
Never buy or rent lists. Most email platforms ban purchased lists in their terms, and messages to strangers drive spam complaints that hurt delivery for your whole list. Consider double opt-in, where subscribers confirm by clicking a link. It keeps typos and fake addresses out.
Step 2: Set up your sending domain
Before your first campaign, make sure inbox providers can verify that your emails really come from you. Your email platform will walk you through three DNS records:
- SPF, which lists the servers allowed to send for your domain
- DKIM, which signs each message so it can't be altered in transit
- DMARC, which tells inbox providers what to do with mail that fails those checks
Google and Yahoo now require these for bulk senders, along with a one-click unsubscribe. See Google's email sender guidelines for the current rules. Send from your own domain, not a free Gmail or Outlook address.
Step 3: Segment your audience
One email to everyone is the fastest way to lose subscribers. Group people by:
- Behavior: bought, browsed, clicked, abandoned a cart
- Stage: new subscriber, first-time buyer, repeat customer, lapsed
- Interest: the lead magnet or product category they signed up for
- Engagement: active in the last 90 days, or not
Start with two or three segments. You can add more once you see how each one behaves.
Step 4: Set up automated flows first
Automated flows run every day without extra work, so build them before you plan regular campaigns:
- Welcome series: two to four emails that introduce you and point to your best content or products
- Abandoned cart: a reminder a few hours after someone leaves items behind
- Post-purchase: a thank-you, how-to tips and a request for a review
- Win-back: a check-in for customers who haven't bought in a while
- Lead nurture: a short sequence of useful emails for B2B leads who aren't ready to talk yet
Then add campaigns: newsletters, launches, seasonal offers and event invitations.
Step 5: Write emails people open
- Keep subject lines short and specific. Say what's inside.
- Use the preview text. It's the second line people see.
- Lead with value: an answer, an idea or an offer worth their time.
- Give each email one main call to action.
- Design for phones first: one column, readable text, big buttons.
- Send from a real person's name when you can.
Step 6: Stay compliant
In the US, the CAN-SPAM Act requires an accurate "from" line, honest subject lines, a valid postal address, and a clear way to opt out that you honor within 10 business days. If you email people in the EU, GDPR requires consent and a record of it. If you collect data from California residents, check whether the CCPA applies to you.
How to measure email success
Track these for every send and every flow:
- Click rate: the share of recipients who clicked a link. It's the most reliable sign of interest.
- Conversion rate: sales, bookings or form fills from email.
- Revenue or leads per email sent: the number that tells you if email pays.
- Unsubscribe and spam complaint rates: early warnings that you're sending too often or to the wrong people.
- Bounce rate: a sign of a dirty list.
Treat open rates with care. Apple Mail Privacy Protection loads images automatically, which counts many emails as opened even if nobody read them. For benchmarks, compare against your own last 90 days and your email platform's benchmark report for your industry. Generic averages from other businesses tell you little.
How to improve results over time
Personalize beyond the first name
A first name in the greeting is the smallest step. Personalization that matters changes what's inside the email: products related to past purchases, content tied to the lead magnet someone downloaded, or a different offer for first-time and repeat buyers. Build it from the segments in Step 3. Check that a missing field falls back to something sensible, so nobody gets "Hi ,".
Test one thing at a time
Split a send into two versions that differ in one way, such as the subject line or the call to action. Send each to a random part of the list, then pick the winner on clicks or sales rather than opens. Keep a simple log of what you tested and what won, so the lessons outlast the campaign.
Keep your list clean
Remove addresses that hard bounce. Send people who haven't opened or clicked in several months a short email asking whether they still want to hear from you, and stop emailing those who don't respond. A smaller list of people who read your emails reaches the inbox more reliably than a big list of people who ignore them.
Common mistakes
- Sending only promotions, so subscribers learn to ignore you
- Keeping inactive subscribers forever, which drags down delivery for everyone
- Testing five things at once, so you can't tell what worked
- Forgetting the plain-text version and image alt text
- Waiting months between sends, then emailing a list that's forgotten you
Email works best with a steady supply of useful material, so pair it with a content strategy. And to see what happens after the click, make sure GA4 is tracking your campaigns.
Want us to check your setup? Send us your site and we'll tell you what's missing from your list building, flows and tracking.
Frequently asked questions
How do I start email marketing for a small business?
Pick an email platform with a free or low-cost plan, verify your sending domain, and add a signup form to your website. Offer something useful in exchange for an address, such as a checklist or a first-order discount. Set up a short welcome series before anything else. Then send one helpful email every week or two and watch clicks, replies and sales.
What is a good email open rate?
There isn't a single good number, and open rates are less reliable than they used to be. Apple Mail Privacy Protection marks many emails as opened automatically. Compare your results against your own last 90 days and your platform's benchmark report for your industry. Clicks, replies and sales are better signs that an email worked than opens are.
How often should I send marketing emails?
Send as often as you have something useful to say, and keep the rhythm steady. For many small businesses that's every week or every two weeks, plus automated flows. Watch unsubscribe and spam complaint rates after each send. If they rise, you're sending too often or to people who've lost interest, so slow down or clean your list.
Is it legal to buy an email list?
In the US, CAN-SPAM doesn't ban buying a list outright, but you're still responsible for every message sent, and harvested addresses carry extra penalties. In the EU, emailing people without consent breaks GDPR. Most email platforms also ban purchased lists. Bought lists bring spam complaints and bounces that damage delivery for your real subscribers too.
Which email marketing platform should I use?
Choose based on what you sell. Online stores usually do well with a platform that connects deeply to their store, such as Klaviyo or Shopify Email. Service businesses often prefer Mailchimp, Brevo or ActiveCampaign. Check that the platform supports segments, automated flows, domain authentication and clear reporting, and start on the smallest plan until your list grows.