How to increase the opening of email newsletters by 2 times

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E-mails still work – if they are opened, of course. In 2026, the average discovery rate barely reaches 22%, and the top companies easily get 40-50% and higher: the difference is not in magic, but in a few simple but effective techniques. For example, a correctly selected time of sending can increase the opening by 15-20%, and a personalized subject of the letter – by another 10-12%. Ready to turn your newsletters from “unnoticed” to “must read”? Let’s figure out how to do it without too much effort.

Why is it important to increase the opening of email newsletters

A high rate of opening email newsletters is not just a number in a report, but a direct path to increased conversion. When the user opens the email, he has already taken the first step: he has entrusted you with his time. According to Campaign Monitor, newsletters with an opening rate above 30% generate 50% more conversions and 25% higher sales conversions. For example, an online clothing store that optimized its email subject line and send time increased opens from 18% to 35% — and sales from mailings increased by 42% in the quarter. This is logical: if the letter is not opened, there will be no clicks or purchases.

The loyalty of the audience also depends on how often your letters are seen. If a subscriber regularly sees your messages (and they are interesting to him), he gets used to the brand. HubSpot research shows that companies that send relevant emails 2-3 times a week have a 30% higher rate of repeat purchases. Conversely, if discovery is low, followers simply stop noticing you — and eventually unsubscribe. In 2026, when mailboxes are overloaded with advertising, every opened letter is a small victory over competitors.

• Budget savings. If opens increase, you pay for the same emails, but get more conversions and sales. For example, with a mailing cost of $0.01 per letter and a base of 50,000 subscribers, an increase in opening from 20% to 40% means +10,000 potential customers at no additional cost.
• Data for analytics. High discovery allows for more accurate audience segmentation. If a certain group opens emails 50% more often, you can create special offers for them — and increase conversion by another 15-20%.
• Reputation of the sender. Mail services (Gmail, Outlook) analyze how often users interact with your emails. If the opening rate is low, they will automatically classify your mailings as spam — and even technically perfect letters will not reach the inbox.

After all, opening an email is not a goal, but a tool. But without it, all other efforts (design, copywriting, personalization) simply do not work. In 2026, when artificial intelligence generates thousands of personalized emails a day, discovery itself becomes the filter that separates effective marketing from the noise.

What factors influence the opening of emails

Email opens depend on several key factors, and if your newsletter isn’t working, look for the problem right here. First, the subject of the letter: it should be short (up to 50 characters), intriguing and personalized. Emails with subjects like “Just for you: 30% off your order today” are opened 22% more often than generic “Special Offer”. Second, time to send: morning (8-10am) and evening (6-9pm) on weekdays show the best results, but it all depends on the audience. For example, it is better to send B2B letters during business hours, and consumer mailings on weekends. Third, frequency of mailings: too frequent letters (more than 2 per week) cause fatigue, and rare ones (once a month) cause forgetfulness. Optimal — 1-2 letters per week, but test. And finally, quality of the subscriber base: if 30% of your contacts are inactive (have not opened emails in six months), they reduce the overall open rate. Regularly clean the database – remove inactive subscribers or run reactivation campaigns.

• Subject of the email: Short, personalized, beneficial (for example, “Your exclusive access to the collection” instead of “New in the season”).
• Sending time: Test different hours, but avoid late evenings – letters get lost in the morning message stream.
• Frequency: Too much is annoying, too little is forgotten. Find the middle ground for your audience.
• Follower base: Active followers = higher opens. Delete “dead” contacts or try to get them back (for example, with a letter “We miss you – come back!”).

Optimizing email subject for maximum exposure

The subject of an email is the first (and often the only) thing a subscriber sees. If she doesn’t pick up in a second, the letter will be sent to the archive or spam. Let’s start with personalization: a name in the subject increases opens by 22-26% (data from HubSpot, 2025). Not just “Olena, special offer”, but “Olena, just for you: -30% on the course until 23:59”. The intrigue works, but without manipulation: “Haven’t you seen this yet?” better than “Sensation! You won’t believe!”. Emotions are your tool: “Finally! Your gift is waiting” arouses curiosity, and “15% discount” arouses indifference. A clear call-to-action (CTA) in the subject line is rare but effective: “Open to get a bonus” or “Today only: confirm participation”.

• Successful examples:
  • “We’ve missed you – here’s your exclusive code”
  • “Your order #12345 is ready to ship”
  • “Why do 9 out of 10 of our customers choose this tariff?”
• Unsuccessful examples:
  • “News of the company for May”
  • “Discount on all products!”
  • “Very important message”

A/B testing is your best friend. Test two topics on 10-15% of the audience, analyze the discovery after 4-6 hours, send the winner to the rest. Pay attention to the length: topics up to 40 characters are opened 8-12% more often than longer ones. Avoid spam words (“free”, “urgent”, “guarantee”) – they reduce delivery by 30-40%. And remember: the subject should correspond to the content of the letter. If you promise “exclusive”, the letter must contain something truly unique – otherwise the subscriber will unsubscribe.

Tools for testing email themes

To increase the opening of email newsletters, test email subjects – it works better than any assumptions. It is most convenient to do this through the built-in tools of services such as Mailchimp or SendPulse. In Mailchimp, for example, it is enough to create two versions of the topic (A/B), specify the percentage of the audience for the test (usually 20-30%) and the waiting time for the results (from 1 to 24 hours). The system will automatically send the winning version to the rest of the subscribers. SendPulse offers similar functionality, but with additional settings: you can test not only topics, but also the time of sending and the name of the sender. For deeper analysis, connect Google Analytics – it will show how different topics affect conversions and conversions. From experience: testing 3-5 topic options on a segment of 1,000 subscribers often gives an increase in discoveries by 15-25%. The main thing is not to stop at one test: optimize topics once every 2-3 months, because the behavior of the audience changes.

• Mailchimp: A/B tests run in one click, supports up to 3 theme options at the same time.
• SendPulse: allows you to test topics along with the time of sending, there is integration with CRM.
• HubSpot: automatically determines the best option based on open and click rates.
• ActiveCampaign: analyzes not only topics, but also user behavior after opening.

Personalization and audience segmentation

Personalization is more than just inserting the name of the subscriber in the subject of the letter. It’s about everyone getting the content they’re really interested in. Start by segmenting your base: segment your followers by demographics (age, gender, location), behavior (how often they open emails, which links they click), and interests (the topics they’re interested in). For example, if you sell sportswear, segment your base into those who buy running shoes and those who choose yoga. Be the first to send reviews of new models for marathoners, the second to send advice on choosing eco-friendly mats.

Data shows: segmented mailings have a 14.31% higher open rate and 100.95% more clicks than non-segmented ones (according to research by HubSpot, 2025). But don’t stop at the basic division. Use dynamic content – for example, show exclusive offers in your email for regular customers, and a “How to get started” guide for newbies. The subject of the letter should also be personalized: instead of “Special offer” write “Olexia, your favorite brand with a 30% discount”.

• By interests: Collect data through subscription forms (“What topics are you interested in?”) or analyze purchase history. If the subscriber bought children’s books, send announcements of new products in this genre.
• By behavior: Track which emails are opened and which are ignored. If someone keeps clicking on your financial literacy articles, add them to your Investment Experts segment and send more in-depth insights.
• By demographics: For residents of Kyiv – announcements of offline events in the city, for pensioners – discounts on home goods with delivery.

Remember: Personalization works when it’s not intrusive. Don’t write “We know you’re 35 and you love sneakers” – it’s better to write “Your favorite models are back in stock.” Test different approaches: A/B testing email topics for different segments will help you understand what resonates with your audience. And do not forget about the time of sending: for parents with children, morning mailings can get lost in the flow, but evening mailings will work better.

How to collect data for effective segmentation

In order to segment the audience effectively, you need data – and the more data, the more precisely the mailing will work. Start with subscription forms: add to them not only a field for email, but also 1-2 questions that will help to understand interests. For example, “What topics are you interested in?” with multiple answers (such as “marketing”, “technology”, “finance”) or “What is your job title?” — this will provide a basis for primary segmentation. Do not overload the form: 3–4 fields are optimal, otherwise the conversion will drop by 20–30%.

Surveys are another powerful tool. A short Google Form or Typeform was sent after the first letter with a request to rate the content on a scale from 1 to 5 or to answer 2-3 questions. The number of respondents will be small (typically 5-10%), but the data will be valuable. For example, if 40% of subscribers indicated that they want more cases, not theories, this is a signal to correct the content plan.

Analytics of behavior on the site reveals real interests better than any survey. Use Google Analytics 4 or Hotjar to track which pages the subscriber visits, how much time he spends on the site, which buttons he presses. For example, if a user visited the page with an overview of CRM systems three times, it is logical to send him letters about business automation. Integrate this data with an email service through Zapier or native plugins (for example, HubSpot or ActiveCampaign) — so segments will be updated automatically.

CRM-systems are a golden vein for segmentation. If you have B2B, integrate mailing with Salesforce, Pipedrive or HubSpot: data about deals, stages of the funnel, history of communications with the customer will allow you to send relevant emails. For example, you can send an onboarding series to a customer who has just signed a contract, and to someone who is stuck in the “demo” stage, a success story with a similar business. Without CRM, it is almost impossible to set up such triggers.

• Behavioral triggers: set up automatic emails based on user actions: opening a previous email, clicking on a link, visiting a specific page. For example, if a subscriber did not open 3 emails in a row, they were sent a personalized offer with the subject “We miss you – here’s an exclusive guide.” Such letters have openings 25–40% higher than standard ones.
• RFM-analysis: segment subscribers according to three parameters: recency, frequency of interaction and amount of expenses (Monetary). For example, “active customers” (opened emails in the last 30 days) will receive one content, and “sleepers” (inactive for 90+ days) will receive another, with an emphasis on returns.

Choosing the optimal sending time and frequency

Time and frequency of sending are not just technical settings, but factors that directly affect whether your email will be opened. A 2025 study from HubSpot found that emails sent between 10am and 12pm on a Tuesday or Thursday were 23% more likely to be opened than on a Monday morning or Friday afternoon. But there is no universal recipe – everything depends on the audience. For the B2B segment, the best days are Tuesday and Wednesday (the peak of activity before planning the week), and for e-commerce, Thursday and Sunday (buyers are preparing for the weekend or casually scrolling through offers).

Don’t go overboard with the frequency, either: weekly newsletters work for most businesses, but if you’re selling everyday products (such as coffee or cosmetics), you can increase to 2-3 emails per week – as long as the content is valuable and not spammy. A/B test: send to part of the base at 9:00 AM and another at 2:00 PM and compare the results. Be aware of time zones: if your audience is spread across the country, set up sending according to the recipient’s local time. And don’t forget about seasonality — in the pre-New Year period, the frequency may increase, and in the summer (especially July) — on the contrary, decrease by 30–40%.

• B2B: Tuesday-Wednesday, 9:00-11:00 or 13:00-15:00 (after lunch people go back to work).
• E-commerce: Thursday 18:00-20:00 (evening shopping) and Sunday 10:00-12:00 (weekly planning).
• Local services (salons, cafes): Wednesday-Friday, 7:00-9:00 (morning routines) or 17:00-19:00 (after work).
• News/Media: Monday 8:00am-10:00am (recap of weekend) or Friday 4:00pm (before weekend).

Using preheaders and previews

A preheader is a short text that appears immediately after the subject of an email in the mailbox or in the preview. It not only complements the header, but also prompts the user to open the email. Research shows that a well-written preheader can increase opens by 15-30% — especially on mobile devices, where it often takes up more space than the subject line. The main task of the preheader is to interest here and now, to answer the question: “Why should I open this letter?”

The correct preheader should be concise (30-50 characters), specific and complement the subject of the letter, not duplicate it. For example, if the subject is: “20% discount on all courses until the end of the week”, the pre-header can sound like this: “Only for subscribers – an additional bonus.” Or for a promotional letter with novelties: the subject is “New collection of spring dresses”, the preheader is “The first 100 orders are a gift.” Avoid vague phrases like “Don’t miss a good offer” – they don’t work because they don’t provide new information.

• What to do: use numbers (“5 tips that will change your business”), questions (“Why are your customers going to competitors?”), urgency (“3 hours left until registration closes”).
• What to avoid: spam words (“free”, “urgent”, “only today” in every letter), too long sentences, repetition of the topic.
• Test: A/B tests show that even changing one word in the preheader can increase opens by 5-7%. For example, “Your personal code” works better than “Special offer for you”.

Remember: the preheader is not just a technical element, but your second chance to attract attention. If the subject of the letter is the title of the article, then the preheader is a subheading that should be intriguing enough for the user not to pass by.

Cleaning the subscriber base and working with inactive users

If only 10-15% of subscribers open your e-mails, the problem often lies not in the subject of the letter or the time of sending, but in the quality of the database itself. Inactive users – those who have not opened letters for six months or a year – are not just “dead weight”: they distort statistics, lower the sender’s rating in the eyes of postal services and can even fall into spam traps. For example, if out of 50,000 subscribers, 20,000 do not interact with the newsletter, the real rate of openings may be 30-40% lower than the declared one. Start with an audit: download a list of subscribers from the last 6-12 months and sort by activity. Remove those who haven’t opened a single email – this will immediately increase the average open rate by 5-10%.

With inactive followers that you are sorry to lose, run a reactivation campaign. Send a series of 2-3 emails with a clear call to action: “We miss you – update your settings” or “Get an exclusive bonus for your first discovery”. Use personalization (name, last purchased product) and limit the validity of the offer – this increases conversion by 15-20%. If after such a campaign 30-50% of subscribers have not reacted, delete them without regret. Remember: email services like Gmail or Outlook evaluate your reputation not by the number of subscribers, but by their engagement. A clean database is not just good statistics, but also a guarantee that your emails will end up in the inbox and not in spam.

• Monthly check your database for inactive subscribers – automate the process with tools like Mailchimp or Klaviyo.
• Segment inactives by duration of inactivity: 3 months, 6 months, year. The longer the period, the more aggressive the offer for reactivation should be.
• Test different approaches: from a simple “We miss you” to discounts or free materials. For example, SaaS companies often offer a free month for returns.
• Don’t forget about the technical side: remove addresses that return errors (hard bounces) – they damage the reputation of the sender more than inactive subscribers.

How to get inactive followers back

Inactive followers are not a reason to delete them, but a chance to regain attention. Start with an exclusive offer: “We missed you! Here’s 20% off your first order after the return” – this email subject works 30-40% better than the standard “We didn’t see you”. A personal appeal also works: instead of “Dear client”, write “Olena, we noticed that you haven’t come in for a long time” – personalization increases openings by 22%.

Try the survey: “Why did you stop opening our emails? Choose a reason: [uninteresting content / too many emails / interests changed]”. This will not only attract attention, but also provide data to improve the mailing. For maximum effect, combine approaches: the first letter is a personal appeal, the second is an exclusive offer, and the third is a survey. If subscribers do not respond after 3 attempts, offer to unsubscribe – this will preserve the quality of the database.

• Example of a letter with an offer: “We saved the best for you! Here is your personal promo code WELCOME20 – valid for 48 hours. We are waiting for you in our store!”
• Example of a personal appeal: “Ivan, we noticed that you haven’t opened our emails since January. Maybe we missed something? Write us back and we’ll fix it!”
• Example survey: “Help us become better! Please rate our letters on a scale of 1 to 5. Your opinion matters!”

Analysis and improvement of results

To increase the opening of email newsletters, start with analytics – without it, optimization is like shooting at random. Track three key metrics: opens (average in 2026 is 20-25% for B2B, 15-20% for B2C), clicks (CTR 2-5% is considered the norm) and unsubscribes (more than 0.5% is a signal of problems with the content or frequency of mailings). If the openings are falling, check the subject of the letter: short (up to 50 characters), personalized (“Olena, especially for you”) and intriguing (“We found an error in your account”) work 30-40% better than template ones. Pay attention to the time of sending – the peak of openings falls on 10:00-12:00 and 14:00-16:00 according to the recipient’s local time.

Clicks depend on the quality of the content and the structure of the letter. Break the text into short paragraphs, use visual elements (buttons instead of links increase CTR by 28%) and check adaptability on mobile devices – 60% of users open emails from smartphones. If unsubscribes increase, analyze the segmentation: too frequent mailings (more than once a week) annoy 42% of subscribers, and irrelevant content – 35%. Run A/B tests on small groups (10-15% of the base) – changing the color of a button or a single word in the subject line can increase opens by 10-15%. Do not forget to clean the database: remove inactive subscribers (have not opened emails for 6+ months) — this will increase deliverability and reduce the risk of getting into spam.

• Opening: Topic, time of sending, personalization.
• Clicks: Letter structure, visual elements, adaptability.
• Unsubscribes: Frequency of newsletters, content relevance, segmentation.