Email marketing that doesn't end up in spam - complete guide

Email has been the most profitable marketing channel for 20 years, with an average ROI of 36 EUR for every 1 EUR spent (Litmus, 2024). But only if it reaches the inbox, gets opened and read. In our internet marketing service email is mandatory - but you can also start it yourself with the right tools.

Choosing a platform

The most popular platforms for 2026, by business size:

• Mailchimp - small business, up to 500 contacts free, simple
• Brevo (ex Sendinblue) - medium, EU-based, GDPR-friendly, better pricing
• Klaviyo - e-commerce, best automations, integration with Shopify/WooCommerce
• ActiveCampaign - B2B, complex automations, lead scoring
• HubSpot - full marketing stack (CRM + email + automation)

For most small businesses in Serbia I recommend Brevo - works in Serbian, has a physical address in EU (GDPR), and has better pricing than Mailchimp.

Deliverability - how to reach the inbox

Your email can be perfect, but if it ends up in the Spam folder, no one reads it. Five things you must set up:

1. SPF, DKIM, DMARC records in DNS (authorize your domain to send)
2. Separate 'sending' subdomain - e.g. mail.yourbusiness.rs instead of yourbusiness.rs directly
3. Clean contact list - no purchased lists, no inactive contacts older than 12 months
4. Double opt-in - user must click 'confirm' in the email after signup
5. Easy unsubscribe link - must be visible, one-click

Test: send the email to yourself on different services (Gmail, Outlook, Yahoo). If it lands in inbox - good. If in Promotions tab in Gmail - not terrible (still gets read). If in Spam - you have a problem.

Subject lines that get opened

The subject line decides 80% of opens. Practice:

• Length: 30-50 characters (more gets 'cut off' on mobile)
• Personalization: use the name - 'John, this is for you' (raises open rate 25%)
• Create curiosity, don't say it all - 'What 90% of businesses get wrong with newsletters' beats 'Newsletter tutorial'
• Avoid SPAM trigger words - FREE!!!, 100% GUARANTEE, BUY NOW
• Emoji optional - small doses, relevant (📈 last quarter vs ❤️ for all clients)

A/B tests are your friend - every platform lets you send 2 subject line versions, see which opens better, and send the winner to the rest of the list.

List segmentation

Sending the same email to your entire list is the biggest mistake. Open rate drops, inactive contacts pile up, eventually services consider you a 'spammer'.

Basic segmentation in every email program:

• Active vs inactive (opened email in the last 90 days?)
• Customers vs prospects (have they bought something?)
• By interest category (women/men, product category)
• By location (local offers)
• By value (VIP, mid, new)

Rule: better to send a relevant email to 30% of the list than a generic email to 100%. The rest stays for another campaign.

Automated sequences

The biggest win in email marketing - automations work while you sleep. Six sequences you should have:

1. Welcome sequence - 3-5 emails for new subscribers, introduces brand and first offers
2. Abandoned cart - brings back customers who left items in the cart (e-commerce only)
3. Post-purchase - thanks, how to use the product, cross-sell
4. Win-back - reactivates inactive subscribers (90+ days without opening)
5. Birthday/anniversary - personalized offer for birthday or anniversary
6. Browse abandonment - if they viewed a product 3+ times, remind them

Klaviyo benchmark: well-set automations make 30-40% of email revenue in e-commerce, while the remaining 60-70% are campaigns (manual, planned sends).

Measuring results

Key metrics:

• Open rate - industry average 20-30% (higher = better subject + similar interests)
• Click rate - 2-5% average (is the link in the email relevant?)
• Conversion rate - 1-3% (sale/lead after click)
• Unsubscribe rate - below 0.5% (more = too frequent or not relevant)
• Bounce rate - below 2% (more = invalid emails in your list)

Most important: revenue per email. Goal is each email brings more revenue than the cost of sending (and sending costs almost nothing).

Need help with email marketing setup or automations? See our internet marketing package or send an inquiry through the contact form - we work with Klaviyo, Mailchimp, ActiveCampaign and Brevo.