Email Marketing Strategies to Increase Open Rates, Email marketing consistently delivers the highest return on investment of any digital marketing channel. But none of that return is accessible if the people on your list are not opening your emails.
Your open rate is the percentage of subscribers who open a given email out of the total number it was delivered to. If you send an email to 2,000 subscribers and 400 of them open it, your open rate is 20 percent. That is the starting point for everything else. Click-throughs, conversions, and revenue from email all depend on the open happening first.
A 40 percent improvement in open rate means taking a 20 percent open rate to 28 percent. It means 160 more people reading your email every time you send one. Over a year, across dozens of campaigns, that increase compounds into a significant difference in how much revenue your email list generates.
The good news is that open rates respond quickly to specific, practical changes. You do not need a bigger list or a redesigned email template. You need to address the factors that determine whether your email gets opened before it gets deleted, and this guide covers the eight most impactful ones.
What a Good Email Open Rate Actually Looks Like
Before working to improve your open rate, it helps to know what you are aiming for. Open rate benchmarks vary significantly by industry, audience type, and email frequency.
According to Mailchimp’s email marketing benchmarks, average open rates across all industries sit between 20 and 25 percent. Transactional emails, which are emails triggered by a specific action like a purchase confirmation or password reset, achieve significantly higher open rates because the recipient is expecting them. Marketing emails, which are the promotional and content-focused messages most businesses send regularly, sit in the 20 to 25 percent average range with significant variation above and below depending on list quality, relevance, and the strategies applied.
A well-optimised email list with good segmentation, strong subject lines, and consistent relevance can achieve open rates of 35 to 45 percent or higher. These are not exceptional results for the top percentile of email marketers. They are achievable for any business that applies the eight strategies in this guide consistently.
The practical implication is that most businesses have significant room to improve their open rates without changing what they send. The strategies that follow are about getting more of your current subscribers to actually open the emails you are already writing.
Strategy 1: Write Subject Lines That Earn the Open
Your subject line is the single most important element in determining whether your email gets opened or deleted. It is the first thing your subscriber sees, and in most cases it is the only thing they read before deciding.
Subject lines that earn opens share several consistent characteristics. They are specific rather than vague. They communicate something immediately relevant to the subscriber. They create a reason to open now rather than later. And they set an expectation for what is inside the email that the email itself can then fulfil.
Short subject lines consistently outperform long ones. Research from Campaign Monitor’s email marketing guides shows that subject lines between 41 and 50 characters perform best on mobile devices, which is where the majority of emails are now opened. Longer subject lines get cut off on small screens, which reduces their ability to communicate the full message.
Personalisation in subject lines works when it is relevant. Including the subscriber’s first name in the subject line can increase open rates, but only when the rest of the subject line is also strong. A weak subject line does not become effective because it starts with someone’s name. First-name personalisation works best in combination with a genuinely relevant message rather than as a standalone tactic.
Curiosity gaps, where the subject line implies something interesting inside without fully explaining it, can drive opens when used selectively. But they need to be earned with content that delivers on the curiosity. A subject line that creates curiosity and then disappoints the opener trains subscribers to stop opening your curiosity-gap emails in the future.
Write five to ten subject line options for every email before choosing the best one. The first subject line you write is rarely the strongest. The best one usually emerges after you have exhausted the obvious options and started exploring less conventional angles.
Strategy 2: Use Preview Text as Your Second Subject Line
Preview text is the short line of text that appears next to or below the subject line in most email clients before the email is opened. Most email senders either ignore it or leave it blank, which causes the email client to pull the first line of the email body, often resulting in something like “View this email in your browser” appearing next to every subject line.
When used deliberately, preview text becomes a second subject line that extends your pitch to the subscriber and gives them an additional reason to open. Together, the subject line and preview text function as a two-line advertisement for the email. If your subject line creates interest, the preview text can strengthen it by adding a specific detail, answering the implicit question the subject line raised, or providing a complementary reason to open.
A subject line that reads “Your website is losing leads every day” paired with preview text that says “Here are the three specific pages where most of them drop off” creates more compelling motivation to open than either line alone.
Most email marketing platforms allow you to set preview text manually. If yours does, set it for every email you send. The additional open rate improvement from well-written preview text is typically between 3 and 7 percent, which adds up significantly across a year of email campaigns.
Strategy 3: Segment Your List So Every Email Feels Personally Relevant
A single email sent to your entire subscriber list will always be less relevant to most recipients than an email written specifically for a defined segment of that list. Relevance is the most powerful driver of email open rates because subscribers who find your emails consistently relevant develop a habit of opening them.
Segmentation means dividing your email list into groups based on characteristics that allow you to send more targeted content. The most basic segmentation divides subscribers by where they are in their relationship with your business: new subscribers who have just joined the list, active customers who have purchased recently, and inactive subscribers who have not engaged in a defined period. Each of these groups benefits from different types of emails, and sending the same content to all three produces mediocre results with each.
Beyond this basic segmentation, more detailed divisions based on what subscribers purchased, what content they have engaged with, what industry they work in, or what problem they indicated when signing up all allow for increasingly relevant messaging. A subscriber who joined your list by downloading a guide about SEO should receive emails related to SEO. A subscriber who purchased a specific product should receive emails about how to get more value from that product.
According to HubSpot’s email marketing research, segmented email campaigns achieve open rates that are 14 percent higher than non-segmented campaigns on average, with click-through rates 100 percent higher. The investment in setting up basic segmentation repays itself quickly in improved performance across every metric.
Strategy 4: Clean Your Email List Regularly to Protect Deliverability
Sending emails to addresses that no longer exist, to subscribers who have not opened an email in over a year, or to addresses that consistently send your emails to spam damages your sender reputation with email providers like Gmail, Outlook, and Yahoo. A damaged sender reputation causes your emails to land in spam folders for all of your subscribers, not just the disengaged ones, which can cause your overall open rate to collapse suddenly.
Email list hygiene is the practice of regularly removing or suppressing addresses that are harming your deliverability. Remove hard bounces, which are emails that could not be delivered because the address no longer exists, immediately. Suppress or remove soft bounces, which are temporary delivery failures, after they occur consistently for the same address.
Identify subscribers who have not opened any of your emails in the past six to twelve months and move them to a re-engagement campaign before removing them entirely. Subscribers who engaged with your emails a year ago and have since gone silent are worth one attempt to re-engage, but if they do not respond to that attempt, removing them improves your deliverability more than keeping them in hopes they will eventually open something.
A smaller list of engaged subscribers consistently outperforms a large list of disengaged ones in every measurable metric. Open rate, click-through rate, conversion rate, and deliverability are all higher when your list is kept clean. Do not measure the health of your email marketing by the size of your subscriber count. Measure it by the engagement rate of the subscribers you have.
Strategy 5: Send at the Right Time for Your Specific Audience
Email open rates vary by the time and day emails are sent because subscriber behaviour varies. An email sent when your audience is most likely to be checking their inbox earns a higher open rate than the identical email sent when they are in meetings, asleep, or otherwise occupied.
General benchmarks suggest that Tuesday, Wednesday, and Thursday mornings between 9am and 11am perform well for professional and B2B audiences who check work email at the start of their day. Thursday afternoon emails perform well for consumer audiences planning weekend activities. But these are averages across millions of sends, and your specific audience may behave differently.
The only way to find the best send time for your specific list is to test it. Most email marketing platforms show you the open rate broken down by time of day and day of week for your historical sends. Look at that data and identify when your list is most responsive. Send your most important campaigns at that time and use off-peak times for lower-priority communications.
Also consider time zones if your list spans multiple regions. Sending an email at 9am in your timezone to subscribers in a different timezone who receive it at 2am produces near-zero opens from that segment. Most email platforms allow time zone-based send scheduling that delivers emails at the local time you specify for each subscriber.
Strategy 6: Get Your Sender Name Right Because It Matters More Than You Think
The sender name is what appears in the “from” field of every email before it is opened. It is the second thing a subscriber sees after the subject line, and for many subscribers it is actually the first thing they check before deciding whether to open.
Emails from a named individual consistently achieve higher open rates than emails from a company name or a generic address. “James from Acme Co” outperforms “Acme Co” because it implies a human behind the email rather than an automated system. People are more willing to open an email from a person they feel they have a relationship with than from an entity that feels impersonal.
Test whether your list responds better to emails from a named individual, a combination of person and company name, or the company name alone. For most B2B lists and small business audiences, a named individual sender produces the best results. For large brand audiences where the company name itself is the trusted signal, the brand name may perform better.
Also ensure that your sending address is a real, monitored email address rather than a no-reply address. A no-reply sending address signals to subscribers that the relationship is one-directional. Some subscribers who would otherwise reply to an email with a question or a purchase intent simply do not because they know no one will read the response.
Strategy 7: A/B Test Subject Lines Consistently to Find What Your Audience Responds To
A/B testing is the practice of sending two versions of an email to equal portions of your list before sending the winning version to the remainder. For open rate improvement, A/B testing subject lines is the highest-impact application.
Send version A of a subject line to 20 percent of your list and version B to another 20 percent. After a defined period, typically four to eight hours, send the version with the higher open rate to the remaining 60 percent. Over time, this process builds a detailed understanding of the specific subject line characteristics your audience responds to.
Test one variable at a time. Do not change both the subject line and the preview text in the same test because you will not know which change produced the difference. Test subject line length one week. Test personalisation versus no personalisation the next. Test question formats versus statement formats after that. Each test produces a specific learning that you can apply to every future email.
Most email marketing platforms including Mailchimp, Klaviyo, and ActiveCampaign have A/B testing built in and make the process straightforward. The cumulative improvement from running consistent subject line tests over six to twelve months typically moves overall open rates by five to fifteen percentage points above the starting baseline.
Neil Patel’s email marketing research documents specific subject line patterns that consistently outperform others across large-scale tests, including the performance difference between question-format, curiosity-gap, and benefit-led subject lines across different audience types. Using these documented patterns as starting hypotheses for your own tests produces faster improvement than testing without a framework.
Strategy 8: Re-Engage Inactive Subscribers Before You Lose Them Permanently
Subscribers who have stopped opening your emails are not necessarily gone forever. Some have changed inboxes. Some have been too busy. Some drifted away when a period of content was less relevant to their situation. A well-designed re-engagement campaign brings a meaningful proportion of them back before you remove them from the list.
A re-engagement sequence typically consists of two or three emails sent specifically to subscribers who have not opened anything in the past six to twelve months. The first email acknowledges the silence directly and asks whether they still want to hear from you. This directness performs better than pretending nothing has changed because it treats the subscriber as an adult who is capable of making a decision about what they want in their inbox.
The second email in the sequence offers something specific and valuable, a discount, a free resource, exclusive content, or a significant announcement, that gives inactive subscribers a concrete reason to re-engage rather than just a reminder that your list exists.
The third email, if the first two receive no response, is a goodbye email. It tells the subscriber they will be removed from the list if they do not click to stay subscribed. A meaningful proportion of genuinely dormant subscribers click to stay when confronted with the prospect of being removed, which is how the goodbye email becomes one of the highest-engagement emails many lists ever send.
Remove subscribers who complete the re-engagement sequence without any interaction. Your deliverability, your sender reputation, and the accuracy of your engagement metrics all improve immediately.
What to Do After Your Open Rate Improves
An improved open rate is the beginning, not the end. Once more of your subscribers are opening your emails, your attention shifts to what happens after the open. Click-through rate, which measures how many openers click a link in your email, is the next metric that determines how much business value your email marketing actually generates.
All the same principles apply. Make your email content as relevant to the subscriber as possible. Include a single, clear call to action that tells the reader exactly what to do next and why it is worth doing. Keep the content focused on one idea per email rather than covering multiple topics that split the reader’s attention.
Email marketing connects directly to the other digital marketing channels your business uses. Subscribers who click through from an email to your website are warm, pre-qualified visitors who convert at significantly higher rates than cold traffic from search or social media. Building the full picture of how email, organic search, and paid advertising work together is part of how Mark X Media’s full services are structured, including the SEO optimization that helps your content earn subscribers in the first place.
Common Email Marketing Mistakes That Damage Open Rates
Sending too frequently exhausts subscribers and trains them to ignore or delete your emails without reading. If your open rate is declining over time without any other explanation, sending frequency is often the cause. Test reducing frequency and measuring whether open rates recover.
Using spam trigger words in subject lines causes emails to be filtered before they reach the inbox. Words like “free,” “guarantee,” “act now,” “limited time,” and excessive exclamation marks all increase the probability of spam filtering. Keep subject lines natural and conversational rather than promotional.
Making it difficult to unsubscribe damages your sender reputation more than losing a subscriber does. When subscribers cannot find the unsubscribe link, they mark the email as spam instead. A clear, easy unsubscribe process keeps your spam complaint rate low, which protects your deliverability for the subscribers who do want to receive your emails.
Sending from a new domain or a new IP address without warming it up first causes deliverability problems. Email providers treat new sending infrastructure as potentially suspicious. Start with small volumes and increase gradually over several weeks when sending from a new domain or platform.
Ignoring mobile optimisation is an increasingly costly mistake. More than half of all emails are opened on mobile devices. Emails that are not designed to be readable on a small screen, with appropriate font sizes, single-column layouts, and clearly tappable buttons, lose a large proportion of potential engagements before the content even has a chance to perform.
The pay-per-click and advertising infrastructure that drives traffic to your email list sign-up points needs to be as well-optimised as the email strategy itself. The quality of the subscribers you attract determines the baseline open rate you are working from. Traffic from highly targeted paid campaigns produces higher-quality subscribers who open more consistently than traffic from broad, untargeted sources.
Learn more about how Mark X Media approaches the full digital marketing ecosystem that email sits within on the about us page. When email strategy is connected to your SEO, your paid advertising, and your website conversion architecture, each channel makes the others more effective.
The Compounding Value of a High-Performing Email List
An email list with strong open rates is one of the most valuable marketing assets a business can build. Unlike social media followers or paid ad audiences, an email list belongs entirely to your business. No platform can remove it, restrict its reach, or charge you to access it.
Every improvement in open rate multiplies the value of that asset. More openers means more click-throughs, more conversions, and more revenue from every email sent. And unlike paid advertising, where results stop the moment spend stops, a well-maintained email list keeps producing returns indefinitely.
Apply these eight strategies consistently, measure your open rates after each campaign, and track the changes. The improvement will not be immediate after the first email, but it will be measurable within the first month and significant within the first quarter.