You can spend hours crafting the perfect email, writing a strong subject line, dialing in your timing, refining every detail, and still miss the mark if your message never makes it to the inbox.
That’s the part we don’t always see. Deliverability works quietly in the background, shaping whether your emails are read or ignored before they even have a chance.
Take Boulevard Brewing Co. After years of growing their list through tours, website signups, and online orders, they had more than 20,000 subscribers. But many hadn’t engaged in a while. The data was there. The opportunity was clear. The risk was, too.
Sending to a cold list can do more harm than good.
So instead of jumping straight into campaigns, they paused and took a more thoughtful approach. Partnering with emfluence, they launched a re-permission campaign, giving subscribers a simple choice to opt back in or step away.
That one decision made a measurable difference:
- 50.6% unique open rate
- 38.1% unique clickthrough rate
- 35% conversion rate
- And 92% of clickers converted on the landing page.
More importantly, it helped rebuild trust with both their audience and inbox providers. Because improving deliverability isn’t just about cleaning up a list. It’s about making sure your message is welcome when it arrives.
What Is Email Deliverability and Why Should You Care?
It’s easy to assume that if your email is “delivered,” your job is done. But there’s a subtle distinction worth paying attention to.
Delivery means the receiving server accepted your email.
Deliverability means it actually landed in the inbox.
That difference matters. You can have strong delivery rates and still struggle with engagement if your emails are ending up in spam or promotions tabs. And once engagement drops, inbox providers start to notice.
Boulevard saw this coming. Rather than risk damaging their sender reputation, they chose to reintroduce themselves carefully. That decision helped them show up where it counts, in the primary inbox.
What Influences Email Deliverability
Deliverability isn’t controlled by a single setting. It’s shaped over time by how you send, who you send to, and how people respond. Here are a few of the biggest factors to keep in mind:
1. Sender Reputation
Internet Service Providers (ISPs) look at your history (engagement, complaints, consistency) to decide whether to trust your emails. Boulevard didn’t have a reputation problem, but they knew sending to an unengaged list could create one. Segmentation and re-permission helped them stay ahead of it.
2. Authentication
Protocols like SPF, DKIM, and DMARC help verify that your emails are legitimate. Without them, your messages can look suspicious, even if everything else is in good shape.
3. List Health
Old, inactive, or purchased email lists drag you down. The turning point for Boulevard came when confirming subscribers still wanted to hear from them. Re-permission campaigns are one of the most effective ways to reset your list and focus on people who actually want to hear from you.
4. Engagement Signals
Opens, clicks, and replies signal interest. Learn more about how iOS 18.2 changed the face of email. Boulevard’s results are a good reminder: when you focus on engaged subscribers, performance follows.
5. Content and Clarity
Overly promotional language, misleading subject lines, or cluttered design can raise flags. A clear, honest message tends to perform better and builds more trust over time.
Boulevard’s opt-in email gave subscribers a simple choice: “Yes, I’m in” or “No, thanks, I’m out,” paired with a friendly tone and clear value.
6. Sending Patterns
Sudden spikes in volume or inconsistent timing can look risky to inbox providers. Gradual, intentional sending helps establish a steady, trustworthy presence.
How to Improve Deliverability of Emails: Best Practices That Work
Optimizing deliverability isn’t a one-time fix. It’s a long-term strategy. Here’s how to strengthen your inbox placement over time:
Make Permission the Foundation
Start with consent. Use confirmed or double opt-in methods, so every subscriber explicitly says yes to receive your messages. Boulevard’s success came from giving people control, not assuming interest.
Clean Your List Regularly
Inactive contacts don’t just lower performance; they hurt your standing with inbox providers. Re-permission efforts like Boulevard’s are a powerful way to trim and strengthen a list in one move.
Segment with Purpose
Not all subscribers should get the same message. Prioritize your most engaged audience, and treat lower-engagement segments with a bit more care.
Test Thoughtfully
Avoid words that trigger spam filters like “Free!!!” or “Act now!”. Use A/B testing to see what resonates and what stays out of the spam folder.
Get Your Technical Setup Right
Authentication isn’t flashy, but it’s essential. Make sure SPF, DKIM, and DMARC are properly configured so inbox providers can trust your emails.
Warm Up Your Domain/IP When Needed
If you’re sending after a long pause or to a newly cleaned list, start small. Build momentum with engaged users before scaling up. Boulevard’s re-permission campaign doubled as a warm-up, which set them up for success.
Protecting Your Email Sender Reputation
Your sender reputation isn’t something you fix once. It’s something you maintain.
A few habits that make a difference:
- Monitor complaint rates and unsubscribes closely
- Avoid purchased or scraped lists entirely
- Be transparent about what subscribers are signing up for in your opt-in process
- Watch engagement trends, not just delivery rates
And don’t ignore the quiet signals. Subscribers who consistently don’t engage may not complain, but their inactivity still affects how inbox providers see you.
That’s why proactive steps, like re-permission campaigns, can be so valuable. They give you a chance to reset expectations and keep your audience aligned. Learn more in our ultimate guide on email deliverability.
The Takeaway
Deliverability can feel technical, but at its core, it’s pretty human.
Are you sending messages people asked for?
Are they engaging with what you send?
Are you building trust over time?
If the answer is yes, you’re on the right track.
At emfluence, our email marketing team takes that bigger-picture approach, combining the technical side with real audience strategy. From audits and segmentation to testing and re-permission campaigns, the goal is the same: make sure your emails don’t just get sent, but actually get seen.
Let’s talk about your deliverability challenges. Contact the emfluence team at expert@emfluence.com and we’ll help you ensure your next email lands exactly where it should, in the inbox.
More on email? We share essential email campaigns every marketer needs in our blog.
