What Is Email Marketing and When It Still Works
Basics4 minInnovialabs editorial team
In short
Email marketing is ongoing communication with people who agreed to receive your emails. It works when messages are timely and relevant: order confirmations, triggers based on user behavior and useful newsletters to a list you own.
The short answer
Email marketing is communicating with customers and prospects through messages sent to their inbox. The key difference from advertising: you write to people who gave you their address and agreed to hear from you. The audience belongs to you, not to an ad platform, and each extra message costs almost nothing.
Email still works when three conditions are met:
- the list was built honestly, with consent;
- emails respond to a specific action or interest;
- you measure results and clean the list.
Three types of emails
| Type | When it is sent | Example |
|---|---|---|
| Newsletter | On a schedule, to the whole list or a segment | Article digest, new products, webinar announcement |
| Trigger email | Automatically after an action or inaction | Abandoned cart, welcome series, renewal reminder |
| Transactional email | As part of the service, in response to an operation | Order confirmation, receipt, password reset, shipping status |
People expect and open transactional emails, so make them clear and well designed. Trigger emails usually perform best among marketing emails because they arrive at the moment of interest. Newsletters keep the relationship alive between purchases.
Send transactional emails through a separate stream or subdomain, so complaints about newsletters do not hurt delivery of receipts and password resets.
Consent and compliance
Buying lists or emailing "cold" addresses scraped from public sources is a fast way into the spam folder. Mailbox providers track complaints and engagement, and data protection laws in many countries require confirmed consent.
What to set up:
- A consent checkbox in the form that is not pre-ticked.
- Double opt-in: a confirmation email after sign-up. The list grows slower but has fewer typos and bots.
- An unsubscribe link in every marketing email that works in one click.
- SPF, DKIM and DMARC for the sending domain. Without them, emails land in spam more often.
Where email works
E-commerce:
- welcome series after sign-up;
- abandoned cart and abandoned browse;
- replenishment for products that run out (cosmetics, pet food, supplies);
- review requests after delivery.
B2B:
- a sequence after someone downloads a guide, checklist or price list;
- webinar and demo invitations;
- a regular expert digest for long sales cycles;
- SaaS onboarding emails that help users take their first steps in the product.
Email is weaker where purchases are impulsive one-offs with no repeat business, and in niches where customers barely use email.
Key metrics
- Deliverability: the share of emails that reach the inbox rather than spam or bouncing.
- Open rate: the share of opens. Today it is imprecise: some email clients load messages automatically, which inflates opens. Use it only to compare subject lines within the same list.
- CTR (click-through rate): the share of recipients who clicked a link. More reliable than open rate.
- Conversion rate: the share of recipients who completed the target action, such as a purchase, lead or sign-up. Track it with UTM tags and site analytics.
- Unsubscribes and spam complaints: a sign that emails are irrelevant or too frequent. Rising complaints quickly hurt deliverability.
- Bounce rate: the share of undelivered emails. Remove hard bounces (non-existent addresses) from the list immediately.
Common mistakes
- Sending the same email to the entire list without segments.
- Keeping inactive subscribers for years, which damages sender reputation.
- Using one large image instead of text.
- Not checking the email on mobile, where most people read their mail.
- Sending from a noreply address and ignoring customer replies.