How to Improve Email Deliverability: Expert Strategies That Work

If your emails are landing in spam instead of inboxes, you’re not alone — and it’s costing you. Email deliverability is one of the most critical factors determining whether your newsletter actually gets read. When inbox placement suffers, even the best content goes unseen.

This guide covers everything you need to improve email deliverability: from domain authentication and sender reputation, to list hygiene and engagement signals. Whether you’re troubleshooting a deliverability problem or building strong habits from the start, you’ll find actionable steps here.

One way to ensure good email deliverability for your newsletter is to work with an email deliverability consultant — but you can also take many of these steps yourself.

What Affects Email Deliverability

Email deliverability is the measure of whether your emails actually reach your subscribers’ inboxes — not their spam or junk folders. It’s not the same as delivery rate, which simply confirms an email was accepted by a mail server. Deliverability goes deeper: it determines inbox placement.

For newsletter creators, this distinction matters enormously. You might have a 99% delivery rate while still having 40% of your emails routed to spam. That means fewer opens, lower click-through rates, and a damaged sender reputation over time.

Several key factors influence whether inbox providers trust your emails. Understanding these is the first step to consistently landing in the inbox.

Inbox Placement vs. Delivery Rate

There’s an important distinction between delivery rate and inbox placement. Delivery rate measures whether a mail server accepted your email — but it doesn’t tell you where it landed. Inbox placement is what actually matters: it measures whether your email ended up in the inbox versus the spam or promotions folder. A 99% delivery rate with 40% spam placement still means nearly half your audience never sees your content.

Why Deliverability Matters for Newsletters

For newsletter creators, deliverability directly impacts your growth. When emails land in spam, your open rates drop, your engagement signals weaken, and your sender reputation degrades — creating a negative cycle that’s hard to reverse. High deliverability means more opens, more clicks, more revenue, and a healthier sender reputation that compounds over time. Treating deliverability as a core part of your newsletter strategy — not an afterthought — is one of the highest-leverage investments you can make.

How to Improve Email Deliverability

To improve email deliverability, focus on the core factors that inbox providers use to judge your emails: domain authentication, sender reputation, and list quality. Here’s a breakdown of what matters most:

Authenticate Your Domain

Domain authentication is the foundation of email deliverability. Without it, inbox providers have no way to verify that you are who you say you are. Set up SPF, DKIM, and DMARC records for your sending domain. These protocols confirm to Gmail, Outlook, and other providers that your emails are legitimate and haven’t been spoofed. BIMI is an additional layer that lets you display your brand logo in the inbox, further building trust. beehiiv handles the core authentication setup for all senders, and you can run your domain through the free DMARC Report Analyzer to check your current configuration.

Warm Up Your Sending Domain

If you’re sending from a new domain or IP address, don’t blast your full list right away. Inbox providers are suspicious of new senders who suddenly send large volumes. Instead, gradually ramp up your sends over weeks — starting with your most engaged subscribers. This process, called domain warming, helps you build a positive sending reputation before scaling. On beehiiv, new accounts go through an automatic warming process, but if you’re migrating from another platform, pay extra attention to your early send volumes and engagement signals.

Maintain List Quality

A healthy email list is one of the most powerful tools for improving deliverability. Remove subscribers who haven’t opened your emails in 90+ days, and use double opt-in to ensure new subscribers are genuinely interested. Avoid purchasing email lists — these contacts haven’t consented and will drive spam complaints. Before large sends, verify email addresses using a tool like Hunter or a built-in list cleaning feature. beehiiv automatically suppresses hard bounces and unsubscribes, but regularly reviewing your engagement data and removing inactive contacts will keep your metrics strong and your sender reputation intact.

Monitor Engagement Signals

Inbox providers like Gmail and Outlook watch how recipients interact with your emails. High open rates, replies, and clicks signal that your content is wanted. Low engagement — especially spam complaints and unsubscribes — damages your reputation. To keep engagement high, send relevant content to segmented audiences, monitor your open and click rates in your and proactively remove inactive subscribers. Segmented emails increase open rates by 14% and clicks by 100%, making list segmentation one of the highest-leverage tactics for improving deliverability metrics.

Technical Factors That Impact Email Deliverability

Several technical factors determine whether your emails reach the inbox. Understanding them is essential for any sender who wants to improve email deliverability at scale.

Sender Reputation

Your sender reputation is a score inbox providers assign to your sending domain and IP address based on your email behavior. High engagement, low complaint rates, and proper authentication all build a positive reputation. Spam complaints, high bounce rates, and sudden volume spikes degrade it. A poor sender reputation is one of the most common reasons emails land in spam — and one of the hardest to recover from once damaged.

Authentication Setup

Email authentication is the technical backbone of deliverability. Without it, inbox providers have no way to confirm your emails are legitimate — which means they'll route them to spam, or reject them entirely. There are four key protocols every sender should have in place:

SPF (Sender Policy Framework) tells receiving mail servers which IP addresses are authorized to send email on behalf of your domain. If an email arrives from an unauthorized IP, it fails SPF and raises a red flag.

DKIM (DomainKeys Identified Mail) adds a cryptographic signature to each email. This lets inbox providers verify that the message wasn't tampered with in transit and genuinely came from your domain.

DMARC (Domain-based Message Authentication, Reporting & Conformance) ties SPF and DKIM together. It tells inbox providers what to do when an email fails authentication — quarantine it, reject it, or let it through — and sends you reporting data so you can monitor misuse of your domain.

BIMI (Brand Indicators for Message Identification) is an optional but increasingly valuable layer that lets you display your brand logo directly in the inbox. It requires a valid DMARC policy and builds visual trust with subscribers.

beehiiv handles core authentication setup for all senders. You can verify your current configuration using the free DMARC Report Analyzer.

Key Variables Affecting Email Deliverability

There are several key variables you need to consider to maximize the deliverability of your emails. An email deliverability expert will have a handle on all of these already, but hopefully, this section will help you understand what to ask a prospective hire or help get you started if you decide to improve your email performance yourself.

Tyler Denk, our beehiiv CEO, has also put together an Ultimate Guide to Email Deliverability for you to go even deeper into these factors.

Email Deliverability Factors

The following sections are the largest factors in determining the deliverability rate of your emails. Keep an eye on these and you should see high performance from your email sends.

Your Subject Lines

Subject lines are incredibly important. A good subject line means you’ll see high open rates and get your emails read by your audience.

Bad subject lines will see your open rates decline, and may also trigger spam filters and prevent delivery altogether.

Spam filters are like detectives. They are looking for clues that an email is spam. These are some spam trigger words you should try avoiding. For example, adding things like “free,” “earn money,” and “lose weight” could trigger a spam content filter.

IP Reputation

Every email sender has an IP address which is assigned a reputation score by email inbox providers and spam filters. This reputation changes over time depending on the actions taken by the sender.

Receiving too many spam complaints, malicious attachments, and previous spam filter catches all reduce your IP reputation.

IP reputation becomes important because if your reputation gets too low, email inbox providers and spam filters will begin banishing your emails to the spam box, never to be seen again.

Email Volume

Large volume senders will have a higher difficulty in maintaining a good standing with inbox providers. A sudden increase in the volume of email sends will trigger bounces from service providers.

Planning becomes incredibly important. You want to ramp up to a large email campaign instead of suddenly sending a large campaign. If you know you will be sending a large campaign for a Black Friday sale, for instance, you’ll want to start slowly increasing your volume for at least a month before that campaign starts.

Engagement Rate

Potentially the largest single factor in email deliverability is your engagement rate. Inbox service providers keep track of open rates, clickthrough rates, spam reports, and unsubscribes. If your newsletters are seen as being unwanted by your list, your sending reputation will decrease. With enough negative signals, your newsletters will eventually become flagged as spam.

To keep your engagement rate high, be sure to constantly monitor your list for subscribers who don’t interact with your email, and segment your audience where possible. Segmented emails increase open rates by 14%, and clicks by 100%, which will drastically improve your engagement rate metrics.

If you were wondering about the best times to send your newsletter to boost your open rates, Jacob here at beehiiv has written about just that in his article, Boost Your Open Rate: The Best Time to Send Your Newsletter.

Bounce Rate

Email bounces are when your email returns because the email address is not currently active or the inbox is full.

Bounce rate is an important metric to inbox providers because a high bounce rate indicates that your list is not being managed properly. To avoid bounces, be sure to limit cold email outreach at scale, do not buy email lists, and monitor your list for those who don’t interact with your content.

Best Practices to Increase Email Deliverability

We’ve discussed the factors impacting email deliverability, so let’s review the best practices to ensure you stay in good standing with inbox providers and keep your IP reputation high.

Segment Your List

Segmented emails increase open and clickthrough rates dramatically. By segmenting your list you will increase your engagement rates, which improves your engagement metrics and your IP reputation.

Maintain and Clean Your List

Keep an eye on subscribers who are no longer interacting with your newsletter emails. If you’re seeing a pattern of no open rates from a subscriber, you could attempt to win them back with an email sequence. If they still don’t want to engage, it’s time to let them go.

By removing subscribers who won’t interact no matter what you do, you are increasing your open rate percentage overall - which is more important than another number on your list of subscribers.

Before sending a large batch of emails, verify the email addresses on your list. People change companies, and data that you once had won't be accurate forever. Hunter did an experiment on 1,000+ email addresses, and the results were stunning.

Around 5.5% of email addresses aren't valid after 8 weeks. Sending emails to invalid addresses will result in bounces which can ultimately create issues for your deliverability.

Keep Things Professional

Be sure to show your brand name and stay away from spam trigger words. Send useful content that members of your audience have subscribed to see.

This will reduce spam complaints - the largest red flag to inbox providers - and keep your IP reputation healthy.

Make It Easy To Unsubscribe

Nobody wants their audience to unsubscribe. But if a member of your list no longer wants to receive your newsletter, it’s time to let them go.

By making it easy to unsubscribe from your newsletter you’ll receive fewer spam complaints, which can significantly harm your sending reputation and overall email deliverability.

Double Opt-In

Enabling double opt-in for your newsletter is another method of keeping a high-quality list.

Double opt-in is adding the step for new subscribers to confirm their email after signing up on your website or landing page. By doing this, you’re ensuring the accuracy of the email and that the new subscriber is invested enough to check their email and respond to you.

You may lose a few subscribers off your number count with this method, but the quality of your list is far more important than the quantity of subscribers you have. Having a high-quality list will ensure higher engagement metrics.

Send Consistently

Email cadence plays a big role in deliverability. Sending too infrequently means subscribers forget who you are, leading to spam complaints. Sending too frequently without valuable content increases unsubscribes and lowers engagement. Establish a consistent sending schedule your audience can expect and stick to it — whether that’s daily, weekly, or bi-weekly. Inbox providers reward senders who maintain regular cadences with consistent engagement.

Wrapping Up

Hiring an email deliverability consultant can help ensure your newsletter lands in as many inboxes as possible. We hope you’ve found the above information helpful for you to conduct interviews from a more knowledgeable perspective - or, if you wish to improve your deliverability factors yourself, you have the tools to start doing so.

Email deliverability isn't a one-time fix — it's an ongoing practice. By authenticating your domain, warming up your sending, maintaining a clean list, and monitoring engagement signals, you give every email the best possible chance of landing in the inbox. The good news: beehiiv handles much of the technical infrastructure for you, so you can focus on what matters — creating content your subscribers actually want to open.

Ready to put these strategies into action?

Sign up for your free beehiiv account today.

Frequently Asked Questions

What is a deliverability consultant?

A deliverability consultant is an expert who helps your emails reach your audience’s inbox instead of getting lost in spam or junk folders. They combine technical knowledge, strategy, and modern tools to make sure your newsletters, marketing campaigns, or transactional emails are delivered consistently and effectively.

Think of them as a coach for your email strategy — they analyze your setup, monitor engagement, and recommend improvements so your emails perform their best.

What is the role of a deliverability consultant?

A deliverability consultant wears several hats, all aimed at improving inbox placement:

• Audit your current email setup — check DNS records, authentication (SPF, DKIM, DMARC, BIMI), and sending infrastructure.

• Monitor and improve IP/domain reputation — ensuring inbox providers trust your emails.

• Guide email volume and warming strategy — ramping up sends safely to avoid spam triggers.

• Analyze engagement metrics — open rates, clicks, replies, and interactions to keep your reputation high.

• Identify and fix issues with inbox providers (ISPs) — like spam filtering, bounces, or blocklists.

What does deliverability mean?

Email deliverability is the measure of whether your emails actually reach your subscribers’ inboxes, not their spam or junk folders.

High deliverability = your emails land where they’re supposed to.
Low deliverability = your emails get lost, ignored, or filtered out, which hurts engagement and ROI.

Deliverability is influenced by things like:

• Email authentication and security (SPF, DKIM, DMARC, BIMI)

• Sender reputation (IP/domain trust)

• Email list quality and engagement

• Volume and frequency of sends

• Content relevance and spam triggers

What is a good email deliverability rate? 

A good email deliverability rate is 95% or higher. This means at least 95% of your sent emails are successfully reaching recipients' inboxes rather than being filtered to spam. Most reputable ESPs and newsletter platforms — including beehiiv (that offers 99% deliverability) — maintain infrastructure designed to help you stay above this threshold. If you're seeing rates below 90%, it's a signal to audit your list quality, authentication setup, and engagement metrics.

Why are my emails going to spam? 

Emails land in spam for several common reasons: missing or misconfigured SPF, DKIM, or DMARC authentication; a low sender reputation from high bounce rates or spam complaints; using spam trigger words in your subject line; sending to an unengaged or unclean list; or a sudden spike in send volume. Start by checking your authentication records, reviewing your bounce and complaint rates, and removing inactive subscribers to rebuild your sender reputation.