Email open rates feel like a vanity metric until they start dropping. When they do, the problem is almost never your subject line. It is usually a combination of list health, deliverability infrastructure, and relevance, all eroding at the same time.
Below are eight specific, practitioner-level things you can fix. Each one moves the needle on its own. Together, they compound.
Quick answer:
- Remove chronic non-openers to protect sender reputation
- Authenticate your domain with SPF, DKIM, and DMARC
- Write subject lines around one clear, specific benefit
- Treat preview text as a second headline, not an afterthought
- Segment so each send reaches people who actually care
- Test send times against your own data, not industry averages
- Send from a real person's name your audience recognizes
- Run a re-permission campaign before dormant contacts hurt you
1. Clean Your List and Remove Chronic Non-Openers
Sending to subscribers who never open drags down your sender reputation and suppresses inbox placement for your active list.
Inbox providers like Gmail and Outlook watch engagement signals. If a meaningful percentage of your sends are going to contacts who never open, never click, and never reply, those providers interpret your mail as low-value and start routing it to the promotions tab or spam, including for contacts who would otherwise open it.
The fix is straightforward. Identify subscribers with zero opens over the past 90 to 180 days, depending on your send frequency. Move them to a suppressed or sunset segment. Do not delete them outright yet, but stop mailing them. Your list will be smaller. Your open rate will be higher. More importantly, your inbox placement for active subscribers will improve.
Most email platforms (Klaviyo, Mailchimp, ActiveCampaign, HubSpot) let you filter by engagement date. This is a one-hour cleanup that pays dividends on every send that follows.
Takeaway: A smaller, engaged list outperforms a large, stale one on every metric that connects to revenue.
2. Warm Up and Authenticate Your Sending Domain
SPF, DKIM, and DMARC records tell inbox providers that your domain is a legitimate sender. Without them, your mail is more likely to land in spam before anyone reads it.
Three DNS records sit at the foundation of email deliverability:
- SPF (Sender Policy Framework): specifies which mail servers are allowed to send on behalf of your domain
- DKIM (DomainKeys Identified Mail): attaches a cryptographic signature to each email so providers can verify it was not tampered with in transit
- DMARC (Domain-based Message Authentication, Reporting, and Conformance): tells receiving servers what to do with mail that fails SPF or DKIM checks, and sends you reports on failures
Google published requirements stating that bulk senders to Gmail must have SPF and DKIM configured, and must have a DMARC policy in place. Yahoo announced equivalent requirements around the same time. These are not best practices anymore. They are table stakes.
If you are sending from a new subdomain or a domain you have not used for email before, warm it up gradually. Start with a small volume of sends to your most engaged contacts, then scale up over two to four weeks. Jumping straight to large volumes from a cold domain triggers spam filters.
Your email service provider likely has documentation on the exact DNS records you need to add. Configure them before your next campaign, and verify them with a tool like MXToolbox.
Takeaway: Authentication is infrastructure, not a tactic. Get it right once and it protects every email you send from that point forward.
3. Write Subject Lines Around One Clear Benefit
A subject line that tries to say three things says nothing. Leading with one specific benefit consistently outperforms clever wordplay in B2B sends.
The most common subject line mistake is trying to tease, inform, and intrigue in 50 characters. The reader has about two seconds. They need to know one thing: what they get if they open this.
"Your Q3 benchmarks are inside" beats "We have some exciting news to share with you this quarter."
"Cut your Google Ads cost per lead before August" beats "Tips for better campaign performance."
The benefit should be specific and immediate. Generic curiosity gaps ("You won't believe this") have eroded because every marketer uses them. What still works: telling a reader exactly what value is waiting for them on the other side of the open.
A few additional mechanics worth testing:
- Personalization tokens (first name, company name, or industry) can lift opens, but only when the rest of the send is actually relevant to that person. Personalization on a mass irrelevant email is noise.
- Length: most inbox providers display 40 to 60 characters on desktop and fewer on mobile. Front-load the benefit. Do not put the payoff at the end of a long subject line that gets cut off.
- Avoid spam trigger patterns, excessive punctuation, ALL CAPS, or phrases that pattern-match to promotional templates, because they can affect filtering before a human ever reads them.
Takeaway: Write the subject line last, after you know exactly what the email delivers, then name that delivery in plain language.
4. Optimize the Preview Text as a Second Headline
Preview text is the 35 to 90 characters displayed next to the subject line in most mobile inboxes. Leaving it blank often defaults to an unsubscribe link, which actively reduces opens.
If your subject line is the headline, your preview text is the deck. Readers scan both before deciding whether to open. Most email clients display preview text alongside the subject line, especially on mobile, where the majority of email is now read.
When preview text is not explicitly set, the client pulls the first readable text from the email body. Depending on your template structure, that might be an image alt tag, a legal disclaimer, or "View this email in your browser." None of those help.
Use preview text to extend the subject line, not repeat it. If your subject line is "Cut your Google Ads cost per lead before August," your preview text might be: "Three settings most accounts miss. Takes 20 minutes to check." The combination gives the reader enough context to decide the email is worth their time.
Set preview text explicitly in your email editor. Most platforms have a dedicated field for it. If yours does not, you can add it as hidden preheader text in the HTML at the top of your email body.
Takeaway: Treat the subject line and preview text as a two-part unit. Writing both intentionally is a five-minute change that affects every open decision your subscribers make.
5. Segment So Every Send Is Relevant
Relevance is the strongest long-term driver of open rates, and you cannot get relevance without segmentation.
A single broadcast list treats a prospect who downloaded a pricing guide the same as a customer who has been paying for two years. Those two people need different information. Sending the same email to both trains both to stop opening.
Effective segmentation does not have to be complicated. Start with a few high-impact splits:
- Engagement tier: active openers vs. occasional openers vs. at-risk contacts. Frequency and content can vary by tier.
- Funnel stage: cold prospects, warm leads, active customers, and past customers all have different needs. The email that converts a prospect is not the same one that retains a customer.
- Industry or vertical: if your product serves multiple verticals, examples and case studies that match the reader's context outperform generic ones.
- Behavior: what someone clicked last time, what page they visited, what they downloaded. Behavioral triggers produce some of the highest open rates of any email type because the send is directly connected to an action the reader just took.
Most platforms that connect to a CRM or marketing automation stack can segment on all of these dimensions. If you track your audience's behavior in your analytics stack, that data can feed segmentation logic in your email tool.
Takeaway: The fastest path to consistently higher open rates is sending emails that fewer people receive but that those people actually care about.
6. Test Send Times Against Your Own Audience
Industry benchmarks for send time are averages across millions of accounts and rarely match the behavior of any individual list.
Tuesday at 10:00 a.m. is not a magic send time. It is the most popular send time, which means it is also the time your subscribers' inboxes are most crowded. Benchmarks published by email platforms are aggregated across every industry, list size, and audience type in their customer base. That average does not describe your list.
The right approach is to run send-time A/B tests with your own subscribers. Split your active segment into two or three cohorts, send the same email at different times, and measure open rate and click rate for each. Do this across two or three campaigns before drawing conclusions. Email behavior is noisy and one test is not enough.
A few patterns that practitioners commonly observe in B2B contexts:
- Sends early in the morning often reach people before their inbox fills up with the day's volume
- Sends on weekday afternoons can catch people during a productivity lull
- Saturday morning sometimes outperforms Tuesday for certain audiences because there is less competition
The only way to know which is true for your audience is to test it. Most email platforms support send-time testing natively. Use the feature.
Takeaway: Stop borrowing benchmarks. Run two rounds of send-time testing on your own list and let your subscribers' behavior set the schedule.
7. Use a Real Human From-Name People Recognize
A real human from-name builds recognition and trust before the reader even reaches the subject line, which is why it is one of the fastest single-field changes that can lift open rates.
The from-name is the first thing a reader sees. It appears before the subject line in most inbox views. "Rudy at RG Digital" is not the same as "RG Digital Marketing" or, worse, "no-reply@rgdm.com."
A person's name signals that a human sent this. It builds familiarity over time. In B2B especially, relationships drive decisions, and an email that feels like it came from a real person gets a different consideration than a broadcast from a company handle.
A few mechanics to consider:
- If one person in your organization already has a relationship with a segment, route those sends under their name
- If you are building an email list from scratch, establish one consistent sender identity early and stick with it. Switching from-names repeatedly erodes recognition.
- The from-name and the from-address should be consistent. "Rudy at RG Digital" paired with a no-reply address sends conflicting signals, because the from-name says "person" while the address says "do not respond."
Make sure replies go somewhere real. An email that invites a reply and then bounces it back with an auto-response saying the mailbox is not monitored breaks the trust the from-name created.
Takeaway: Change your from-name to a real person's name paired with your brand, and make sure replies land in an inbox someone actually reads.
8. Re-Permission Dormant Subscribers Before They Hurt You
A re-permission campaign asks lapsed subscribers to confirm they still want email. Those who do not respond should be removed to protect deliverability.
Before you retire a dormant segment entirely, run a re-permission campaign. It serves two purposes: it recovers subscribers who are still interested but disengaged, and it gives you a clean basis for removing the rest without guessing.
A re-permission email is direct. It tells the subscriber they have not opened your emails in some defined period, that you want to make sure they still want to receive them, and gives them one clear action to take to stay on the list. Keep it short. One link. One ask.
Contacts who click the confirmation link go back into your active list. Contacts who do not click within a defined window (seven to fourteen days is common) get moved to a permanent suppression list and removed from future campaigns.
What this does for your deliverability: your complaint rate drops because the people most likely to mark your email as spam are often dormant subscribers who have forgotten they opted in. Your engagement rate rises because the numerator (opens) stays similar while the denominator (sends) shrinks. Inbox providers see higher engagement and route your subsequent campaigns more favorably.
Run a re-permission campaign once, then build a rule: any subscriber who crosses 180 days of no opens enters an automated sunset flow before they land in the dormant pile.
Takeaway: A re-permission campaign is not about losing subscribers. It is about keeping the list honest so that the subscribers who remain actually move the metrics that matter.
Frequently Asked Questions
What is a good email open rate?
Open rates vary by industry, list size, and audience type. Across B2B email, open rates measured after Apple's Mail Privacy Protection (MPP) change in 2021 are significantly inflated for many senders because MPP pre-fetches images and triggers an open signal regardless of whether a human actually opened the email. Treat open rate as a directional signal and trend it over time rather than benchmarking against a single industry number. Click rate and click-to-open rate are more reliable engagement signals in a post-MPP environment.
Why are my open rates dropping?
Open rate drops typically come from one or more of three causes. First, list decay: a growing share of your list has stopped engaging, dragging the average down. Second, deliverability erosion: missing or misconfigured authentication (SPF, DKIM, DMARC) or increased complaint rates are pushing more mail to spam. Third, relevance loss: you may have shifted your content focus in ways that no longer match what subscribers expected when they opted in. Diagnosing which cause is driving the drop determines the right fix.
Does send time affect open rates?
Send time affects open rates, but the effect size varies by audience and is smaller than most marketers assume. The bigger levers are list health, deliverability, subject line quality, and relevance. That said, sends that land when an inbox is less crowded tend to get more attention than sends that compete with 40 other emails arriving at the same time. The only way to find the right time for your list is to A/B test send times across multiple campaigns using your own data.
How do I improve sender reputation?
Sender reputation is built by consistent, authenticated sending to people who want your email and take action on it. The specific steps: configure SPF, DKIM, and DMARC on your sending domain; remove chronic non-openers from your active list; keep complaint rates low by only emailing people who opted in; warm up new domains gradually before sending at full volume; and monitor your deliverability using tools like Google Postmaster Tools for Gmail-specific reputation data.
How often should I email my list?
Frequency depends on what your audience signed up to receive and how much value you can consistently deliver. Sending more often than you can maintain quality trains subscribers to expect low-value sends and stop opening. Sending so infrequently that subscribers forget you increases unsubscribe and complaint rates when you do send. For most B2B lists, a consistent cadence of one to four sends per month outperforms sporadic high-volume pushes. Test frequency the same way you test send time: vary it, watch engagement, and let the data decide.
Should I buy an email list to increase reach?
No. Purchased lists consist of contacts who never opted in to hear from you. Sending to them triggers high complaint rates and spam trap hits, which damages your sender reputation for your legitimate subscribers as well. Inbox providers do not distinguish between the two groups. A purchased list is more likely to accelerate deliverability problems than solve a reach problem. Build your list through owned channels: lead magnets, gated content, on-site opt-in forms, and event registrations.
What is the difference between open rate and click-to-open rate?
Open rate is the percentage of delivered emails that register an open. Click-to-open rate (CTOR) is the percentage of people who opened the email who also clicked a link inside it. CTOR is a measure of email content quality independent of the subject line, because it only counts people who already opened. A high open rate with a low CTOR usually means the subject line and preview text over-promised relative to the content inside. Tracking both gives you a clearer picture of where the problem is.
Running email at scale means building systems, not sending blasts. The tactics above are the ones that matter most in aggregate: list health protects deliverability, authentication earns inbox placement, and relevance keeps engagement compounding over time.
If you want a look at how your full marketing stack, including your email pipeline, connects to revenue, book a strategy call with our team. We will show you where the gaps are and what it takes to close them.
For more on tracking the metrics that actually connect to business outcomes, visit the RGDM analytics services page or browse the insights library for related guides.