Key takeaways ✨
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It’s exciting to see your subscriber list grow with a fresh audience. But after the initial handshake, it can start to feel like you’re being ghosted. When open rates stall—yes, you should still have a pulse on how they trend—the instinct is to blame a dull subject line or a clunky design.
Here’s the thing: those fixes won’t help if the real problem is where your email is landing. That’s a deliverability problem.
Let’s dig into why your messages might be missing the inbox—and what to do about it.
Table of contents
- Delivery vs. deliverability: what’s really happening behind the scenes
- The usual suspects: common deliverability killers
- How to fix your deliverability
- Now that you’re in the inbox, make it worth the trip
Delivery vs. deliverability: what’s really happening behind the scenes
Before we talk fixes, it helps to understand what’s going on under the hood. Let’s start by clearing the air: delivery vs. deliverability are not the same things.
- Delivery—the metric your ESP provides—simply means a receiving server accepted your email.
- Deliverability is whether that email actually lands in the inbox where your subscriber will see it.
Mailbox providers like Gmail and Outlook are constantly evaluating sender behavior, and one of the biggest signals they look at is engagement history. If your subscriber base is consistently ignoring your emails—or worse, marking them as junk—providers will start routing your messages to the spam folder. If your subscribers aren’t checking spam, they’re probably not ignoring your email, they’re just not seeing it. And be honest, how many non-email marketers do you know who actually check spam?
The usual suspects: common deliverability killers
A few culprits of poor deliverability tend to show up again and again:
Complaint spikes. A surge in spam complaints can quickly tank your sender reputation. A “complaint” happens when a subscriber marks your email as “junk” or “spam,” and it sends a strong negative signal to mailbox providers.
List acquisition issues. If contacts weren’t acquired with clear, explicit consent, you’re likely emailing people who don’t remember signing up—and frequency is one of the main reasons people complain. Our 2026 Email Deliverability Benchmark Report shows that stricter acquisition practices (confirmed opt-in or no pre-checked boxes) lead to better deliverability outcomes.
Too many inactive addresses. Sending to a large pool of unengaged subscribers signals to mailbox providers that your messages aren’t resonating, which generally leads to higher bounce rates.
Sending frequency issues. Mailing too frequently or not frequently enough can both hurt engagement. If subscribers feel overwhelmed—or have simply forgotten you exist—they’ll tune out.
Unlock 2026 inbox benchmarks now
Download Validity’s 2026 Email Deliverability Benchmark Report and learn how your inbox placement compares before your next send.
How to fix your deliverability (yes, it’s fixable)
The good news: deliverability problems are fixable. Don’t expect an overnight turnaround, but if you start focusing on strategy, it’s absolutely possible to dig out of this hole.
1. Rebuild reputation through engaged segments.
Nobody wants to hear this one, but it works. Pull back from sending to your full list and focus your sends on your most active subscribers. Consistent positive signals from this group will help rebuild your sender reputation over time.
2. Audit your send frequency.
Analyze your subscribers and their lifecycle stages. Understand who can handle higher frequency versus where tolerance tends to drop off. Highly engaged subscribers are often happy to hear from you daily, while less active contacts should probably only receive 1-2 messages per week.
3. Implement a re-engagement flow and sunset policy.
If a subscriber hasn’t interacted with your brand in more than six months, move them into a re-engagement series. If that doesn’t win them back, suppress them going forward. A smaller, active list will outperform a large, dormant one every single time. While you’re at it, do some list hygiene—remove invalid addresses, since they could be part of a spam trap network.
4. Improve your sign-up process.
Make sure new subscribers know exactly what they’re signing up for. Whenever possible, share the type of content and the frequency they should expect, and always communicate the value of being part of your email program. That doesn’t have to mean a discount or an offer—value can be exclusive invites, early product updates, or insider content. Transparency upfront means fewer disengaged subscribers down the road.
Now that you’re in the inbox, make it worth the trip
Once you’ve addressed the deliverability fundamentals, it’s time to focus on real engagement. That means going beyond open rate trends and tracking more meaningful metrics like click-to-open rate (CTOR) and conversion rates.
Segment your subscribers so they’re receiving content that’s actually relevant to them—not a generic blast to everyone on the list. And don’t be afraid to invite a reply. Two-way interactions, like asking a question or making it easy to give feedback, are exactly the kind of engagement signals mailbox providers are looking for.
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The bottom line
It’s frustrating when your hard work goes unseen. But by shifting your focus from “how do I look?” to “how am I arriving?”, you can close the gap between a new subscriber and a loyal reader. Start with your technical health, address the root causes, clean your list, and prioritize quality over quantity.
When you’ve got deliverability dialed in, you can be confident that when you have something important to say, your audience will actually see it.
Looking to get a deeper dive into deliverability trends and tips you can implement into your email program? Check out Validity’s 2026 Email Deliverability Benchmark Report.
What’s hurting your deliverability?
Explore key factors behind inbox placement and how you can take control of your email deliverability strategy.
Julie Stuck is a Sr. Email Strategist at Validity.
