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Email marketing

Email newsletter best practices: 15 rules behind a 49% open rate

By Ahmad Khan, founder of Be Leaded. Updated September 24, 2026. 3 min read.

The short answer: A newsletter people open has a sender they recognize, a subject line that says what's inside, one useful idea per issue, a clean list, a schedule readers can predict, and a design that works on a phone with images off. MailerLite's 2025 benchmark put the median open rate at 43.46% across 3.6 million campaigns. The programs we run average 49%, and the fifteen rules below are how.

Where the bar is

MailerLite's benchmark of 3.6 million campaigns sent between December 2024 and November 2025 put the median open rate at 43.46%, the click rate at 2.09%, the click-to-open rate at 6.81% and the unsubscribe rate at 0.22%. Privacy features inflate open rates for everyone, so treat opens as a trend line and clicks, replies and unsubscribes as the truth. Our programs average 49% opens, with spam complaint rates at zero on the accounts we run.

Sender and subject

  1. Send from a person's name at the brand. "Maya at Kettle & Crane" gets opened. "Kettle & Crane Newsletter" gets filed.
  2. Authenticate the domain. SPF, DKIM and DMARC on the sending domain, and one-click unsubscribe headers. Gmail and Yahoo require both for bulk senders.
  3. Subject lines say what's inside. Specific beats clever. "Colombia is back" beats "You won't believe what just landed."
  4. Preview text finishes the thought. It's the second line of the subject, not a repeat of it.

Content

  1. One idea per issue. A single useful point made well, with one clear next step. Three offers in one email get zero clicks.
  2. Write like a note from someone who knows the subject. Short sentences, first person, no press-release voice.
  3. Lead with the reader. What's new for them, not what's new at the company.
  4. Invite replies. "Reply and tell me how you brewed it" turns a broadcast into a conversation, and replies help placement.

The list

  1. Only people who asked. Purchased lists destroy sender reputation and break the law in most places.
  2. Suppress bounces and complaints immediately. A hard bounce sent twice tells providers you don't manage the list.
  3. Re-engage or remove quiet subscribers. Anyone who hasn't opened in six months gets one "still want these?" email, then leaves. A smaller engaged list outperforms a large dead one.

Design

  1. Build for Gmail, Outlook and Apple Mail, on a phone, in dark mode. Test all of them before every send. The newsletter samples in our gallery are built this way.
  2. Readable with images off. Live text for anything that matters, alt text on every image, and never a headline inside a picture.

Cadence and measurement

  1. Same day, same time. Weekly or every two weeks suits most brands. Consistency matters more than frequency.
  2. Measure clicks, replies and unsubscribes per send, and change one thing at a time. A jump in unsubscribes after an issue tells you more than any open rate.

Pre-send checklist

  • Sender name is a person, reply-to is monitored
  • Subject line says what's inside, preview text adds to it
  • One idea, one next step
  • Physical address and unsubscribe link in the footer
  • Test sends checked in Gmail, Outlook and Apple Mail, light and dark
  • Links tested, images have alt text
  • Bounces and unsubscribes from the last send suppressed

FAQ

What is a good open rate for a newsletter?

MailerLite's 2025 benchmark put the median at 43.46% across all industries. Above 45% is good, and the programs we run average 49%. Open rates are inflated by privacy features, so watch clicks and unsubscribes too.

How often should I send a newsletter?

Weekly or every two weeks for most brands, on the same day at the same time. Send only when there's something worth reading. A skipped issue costs less than a filler one.

What should a newsletter include?

One useful idea, written like a note from a person, with one clear next step. Add a short offer if you have one. Leave out the company news nobody asked for.

Which platform should I use?

Most of our programs run on MailerLite. Any major platform works if it supports authentication, one-click unsubscribe and segmentation. The list and the writing matter more than the tool.

Sources

  1. MailerLite, Email marketing benchmarks 2025
  2. Google, Email sender guidelines
  3. Yahoo Sender Hub, Sender best practices
  4. RFC 8058, One-click unsubscribe

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