{"id":880,"date":"2026-06-15T07:39:31","date_gmt":"2026-06-15T07:39:31","guid":{"rendered":"https:\/\/inboxwarm.ai\/blog\/?p=880"},"modified":"2026-06-15T07:39:31","modified_gmt":"2026-06-15T07:39:31","slug":"how-to-improve-email-deliverability","status":"publish","type":"post","link":"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/","title":{"rendered":"How to Improve Email Deliverability: 14 Fixes That Actually Move Inbox Placement"},"content":{"rendered":"<div style=\"background-color: #f4f8fb; border: 1px solid #bad7f2; border-left: 6px solid #1a73e8; padding: 25px; margin: 30px 0; border-radius: 8px; font-family: Arial, sans-serif; line-height: 1.6; color: #333333;\">\n<p style=\"margin: 0 0 15px 0;\"><strong style=\"display: block; font-size: 18px; margin-bottom: 15px; color: #1a73e8; text-transform: uppercase;\">TL;DR<\/strong><\/p>\n<ul style=\"margin: 0; padding-left: 20px; color: #333333;\">\n<li style=\"margin-bottom: 12px;\"><strong>Email deliverability <\/strong>is not about writing better subject lines. It is about how inbox providers evaluate your domain, your infrastructure, and your sending behaviour.<\/li>\n<li style=\"margin-bottom: 12px;\"><strong>The 14 fixes in this guide <\/strong>cover authentication, domain reputation, list hygiene, content signals, sending patterns, and warm-up, in the order that actually moves the needle.<\/li>\n<li style=\"margin-bottom: 12px;\"><strong>Most deliverability problems <\/strong>are fixable within days if you know what to look at. This guide tells you exactly where to start.<\/li>\n<li style=\"margin-bottom: 0;\"><strong>Fix the infrastructure first. <\/strong>Great copy on a broken domain still lands in spam.<\/li>\n<\/ul>\n<\/div>\n<p>You are not losing deals because your product is bad or your pitch is wrong. You are losing them because your emails are not reaching anyone. According to a 2023 report by EmailToolTester, around 16.9% of all legitimate emails never reach the inbox. That number climbs significantly for cold email senders on new or unwarmed domains. The leads are there. The emails just are not getting through.<\/p>\n<p>Email deliverability is the measure of how consistently your emails land in the primary inbox rather than spam, promotions, or oblivion. It is not a single setting you toggle. It is the combined result of your domain&#8217;s authentication setup, your sender reputation, your list quality, your content, and your sending behaviour. Every one of those factors is measurable and fixable, which is exactly what makes deliverability problems so frustrating: the answer is right there, but most senders have no idea where to look.<\/p>\n<p>This guide covers 14 specific, actionable fixes that actually move inbox placement rates. Not vague advice like &#8216;clean your list&#8217; or &#8216;avoid spam words.&#8217; Real changes with real impact, organised from infrastructure (fix this first, always) through to sending behaviour (fine-tune this once the foundation is solid).<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#what-is-email-deliverability-and-why-is-it-so-hard-to-fix\" >What Is Email Deliverability and Why Is It So Hard to Fix?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#what-infrastructure-fixes-have-the-biggest-impact-on-deliverability\" >What Infrastructure Fixes Have the Biggest Impact on Deliverability?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#how-do-you-build-and-protect-your-domain-reputation\" >How Do You Build and Protect Your Domain Reputation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#which-list-hygiene-practices-actually-improve-inbox-placement\" >Which List Hygiene Practices Actually Improve Inbox Placement?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#what-content-changes-actually-improve-email-deliverability\" >What Content Changes Actually Improve Email Deliverability?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#how-does-your-sending-behaviour-affect-inbox-placement\" >How Does Your Sending Behaviour Affect Inbox Placement?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#what-is-the-priority-order-for-fixing-email-deliverability\" >What Is the Priority Order for Fixing Email Deliverability?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#fixed-your-authentication-the-next-step-is-warming-up-your-domain\" >Fixed your authentication? The next step is warming up your domain.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/inboxwarm.ai\/blog\/how-to-improve-email-deliverability\/#final-thoughts\" >Final Thoughts<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-is-email-deliverability-and-why-is-it-so-hard-to-fix\"><\/span>What Is Email Deliverability and Why Is It So Hard to Fix?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Email deliverability refers to the ability of an email to reach a recipient&#8217;s primary inbox rather than being filtered into spam, promotions, or blocked entirely. It is distinct from email delivery, which simply means the email was accepted by the receiving server. An email can be delivered and still never reach the inbox. Deliverability is about where it lands, not just whether the server accepted it.<\/p>\n<p>What makes it hard to fix is that no inbox provider publishes a clear rulebook. Google, Yahoo, and Microsoft all use proprietary filtering systems that combine hundreds of signals: your domain&#8217;s authentication records, its sending history, engagement rates from past recipients, content patterns, blacklist status, and much more. None of them will tell you exactly why your emails are failing. You have to work backwards from symptoms.<\/p>\n<p>The good news is that most deliverability failures trace back to a small set of root causes. Fix those and the rest follows. The 14 fixes in this guide are organised in priority order: start from the top and work down. If your <a href=\"https:\/\/inboxwarm.ai\/blog\/sender-score-guide\/\" target=\"_blank\" rel=\"noopener\">sender score<\/a> is already low, fixing infrastructure alone will not instantly recover it. Reputation takes time to rebuild. But you cannot rebuild it without fixing the infrastructure first.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"what-infrastructure-fixes-have-the-biggest-impact-on-deliverability\"><\/span>What Infrastructure Fixes Have the Biggest Impact on Deliverability?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>These three fixes are non-negotiable. If your authentication records are missing or broken, nothing else in this guide will matter. Inbox providers make their first trust decision based on your DNS records before they even look at your content.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-882 size-large\" src=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-1024x427.webp\" alt=\"Three email deliverability infrastructure fixes: authentication setup, dedicated sending domain, and blacklist checking\" width=\"1024\" height=\"427\" srcset=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-1024x427.webp 1024w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-300x125.webp 300w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-768x320.webp 768w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-1536x640.webp 1536w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-450x187.webp 450w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-780x325.webp 780w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability-1600x667.webp 1600w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Infrastructure-Fixes-Have-the-Biggest-Impact-on-Deliverability.webp 1942w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<h3>Fix #1: Set Up SPF, DKIM, and DMARC Correctly<\/h3>\n<p>SPF, DKIM, and DMARC are the 3 DNS authentication records that tell receiving servers your domain is legitimate, and your emails have not been tampered with. Without them, you are sending email as an unverified sender, and every major inbox provider treats you accordingly.<\/p>\n<p>SPF lists every server authorised to send on your behalf. DKIM signs each email with a cryptographic key so the receiving server can verify the message is unaltered. DMARC sits on top of both and tells receiving servers what to do when either check fails: monitor, quarantine, or reject.<\/p>\n<p>Google and Yahoo&#8217;s 2024 sender requirements made all three mandatory for bulk senders. Before launching any campaign, make sure your authentication records are configured correctly and fully aligned.<\/p>\n<p>Once your records are live, the next step is monitoring sender reputation and deliverability performance. Tools such as <a href=\"https:\/\/inboxwarm.ai\/blog\/spf-dkim-and-dmarc-explained\/\" target=\"_blank\" rel=\"noopener\">SPF, DKIM, and DMARC checkers<\/a> can help verify your configuration, but authentication alone is not enough.<\/p>\n<h3>Fix #2: Use a Dedicated Sending Domain<\/h3>\n<p>If you are sending cold email from your primary company domain, you are one bad campaign away from damaging the domain your entire business runs on. A deliverability incident on your main domain can affect your transactional emails, your team&#8217;s outbound sales, and every other email your company sends.<\/p>\n<p>The fix is to send cold email from a dedicated subdomain or a separate domain entirely. Something like outreach.yourcompany.com or yourbrandco.com. This isolates your cold email sending reputation from your main domain. If something goes wrong, the damage is contained. Your primary domain stays clean.<\/p>\n<p>Set up the same SPF, DKIM, and DMARC records on your sending domain as you would on your main domain. Treat it as a full sending infrastructure, not a throwaway alias.<\/p>\n<h3>Fix #3: Check Whether Your Domain or IP Is Blacklisted<\/h3>\n<p>Being on a blacklist does not always announce itself loudly. Many senders on blacklists see gradual deliverability decline rather than sudden complete failure. Emails keep getting accepted by receiving servers but increasingly land in spam or get silently dropped.<\/p>\n<p>Blacklists like Spamhaus, Barracuda, and SORBS are actively consulted by most inbox providers. A single listing can tank inbox placement across multiple mailbox providers simultaneously. Check your sending domain and IP address regularly using the InboxWarm <a href=\"https:\/\/inboxwarm.ai\/tools\/esp-checker\" target=\"_blank\" rel=\"noopener\">ESP Checker<\/a> and <a href=\"https:\/\/inboxwarm.ai\/tools\/whois-checker\" target=\"_blank\" rel=\"noopener\">WHOIS Checker<\/a>. If you find a listing, most blacklists have a delisting request process, but you will need to fix the underlying sending behaviour first, or you will be re-listed quickly.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"how-do-you-build-and-protect-your-domain-reputation\"><\/span>How Do You Build and Protect Your Domain Reputation?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Authentication proves your identity. Reputation determines your trustworthiness. A domain with perfect authentication records and a damaged reputation will still land in spam. Reputation is earned through consistent, clean sending behaviour over time, and it can be damaged much faster than it can be built.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-885 size-large\" src=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-1024x427.webp\" alt=\"Line graph comparing domain reputation over time between a sender who warms up their domain versus one who sends at full volume immediately\" width=\"1024\" height=\"427\" srcset=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-1024x427.webp 1024w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-300x125.webp 300w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-768x320.webp 768w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-1536x640.webp 1536w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-450x187.webp 450w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-780x325.webp 780w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation-1600x667.webp 1600w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/How-Do-You-Build-and-Protect-Your-Domain-Reputation.webp 1942w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p><strong>Fix #4: Warm Up New Domains Before Sending Campaigns<\/strong><\/p>\n<p>This is the most common mistake cold email senders make. A new domain has zero sending history. Inbox providers do not know whether to trust it. Sending hundreds or thousands of emails from a brand-new domain on day one is a guaranteed path to spam folders and potential blacklisting.<\/p>\n<p>Email warm-up is the process of gradually increasing send volume from a new domain while generating positive engagement signals: emails being opened, replied to, and rescued from spam. This teaches inbox providers that your domain sends email that people actually want to receive, which builds the reputation needed for inbox placement at scale.<\/p>\n<p>InboxWarm.ai automates this process across all your sending domains. It runs real engagement signals with real mailboxes, not fake accounts, so the reputation you build is genuine and durable. If you want to understand what the process looks like before committing to a tool, the <a href=\"https:\/\/inboxwarm.ai\/blog\/free-email-warmup\/\" target=\"_blank\" rel=\"noopener\">free email warm-up guide<\/a> walks through what you can do manually and where the limitations are.<\/p>\n<p><strong>Fix #5: Keep Your Spam Complaint Rate Below 0.10%<\/strong><\/p>\n<p>Google&#8217;s Postmaster Tools gives you a direct window into how Gmail recipients are marking your emails. A spam complaint rate above 0.10% puts you in the warning zone. Above 0.30% and Google will begin throttling or blocking your emails. These thresholds are not soft guidelines: they are enforced.<\/p>\n<p>The main drivers of high complaint rates are sending to people who never opted in, emailing contacts whose consent is stale, and sending too frequently to low-engagement contacts. All three are fixable with better list hygiene and sending frequency controls.<\/p>\n<p>Set up Google Postmaster Tools on every sending domain today if you have not already. It is free, it gives you spam complaint rates, domain reputation scores, and IP reputation data, and it is the most direct feedback loop you have on how Gmail is evaluating your sending.<\/p>\n<p><strong>Fix #6: Never Send to Unverified or Purchased Email Lists<\/strong><\/p>\n<p>Purchased lists are one of the fastest ways to destroy a sending domain&#8217;s reputation. The contacts on those lists did not ask to hear from you. Many of the addresses are stale or inactive. A significant percentage are spam traps, addresses maintained by blacklist operators specifically to identify and flag senders with poor list hygiene.<\/p>\n<p>Hitting a spam trap once can land you on a blacklist within hours. Hitting recycled spam traps repeatedly is how domains end up with permanent reputation damage that takes months to recover from. Verify every email address before sending using a reliable email verification tool. Remove hard bounces immediately after every campaign. A bounce rate above 2% is a red flag that most inbox providers treat as a signal of poor list hygiene.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"which-list-hygiene-practices-actually-improve-inbox-placement\"><\/span>Which List Hygiene Practices Actually Improve Inbox Placement?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Your list quality is a direct input into your deliverability. Every invalid address you send to generates a bounce. Every disengaged contact who ignores your emails for months is a drag on your engagement rate.<\/p>\n<p>Every person who marks you as spam because you emailed them too many times is a direct strike against your domain reputation. List hygiene is not a one-time task. It is an ongoing process.<\/p>\n<h3>Fix #7: Verify Email Addresses Before Every Campaign<\/h3>\n<p>Email addresses go invalid faster than most senders realise. Studies suggest that email lists decay at a rate of roughly 22% per year. People change jobs, companies rebrand their domains, and mail servers get decommissioned. An address that was valid six months ago may generate a hard bounce today.<\/p>\n<p>Hard bounces are expensive from a deliverability standpoint. A bounce rate above 2% signals to inbox providers that you are not maintaining your list, which is associated with spammy sending behaviour. Verify your list before each campaign, not just when you first acquire the contacts. Remove hard bounces within 24 hours of a campaign going out.<\/p>\n<h3>Fix #8: Segment and Suppress Low-Engagement Contacts<\/h3>\n<p>Sending to contacts who never open, click, or reply to your emails is not neutral. It actively hurts your deliverability. Inbox providers track engagement rates at the domain level. If your emails consistently receive low engagement from a large percentage of recipients, that pattern suppresses your inbox placement for everyone you send to, including the contacts who would have engaged.<\/p>\n<p>The practical fix: segment your list by engagement level. Contacts who have not opened or replied in 90 days go into a re-engagement segment. Run a targeted re-engagement campaign to that segment with a lower send frequency. Anyone who still does not engage after the re-engagement sequence gets suppressed. Do not keep emailing people who are clearly not interested: it costs you reputation on every send.<\/p>\n<h3>Fix #9: Remove Role-Based and Shared Email Addresses<\/h3>\n<p>Role-based addresses like info@, support@, admin@, sales@, and team@ are typically monitored by multiple people or automated filtering systems. They have very low engagement rates and very high spam complaint rates. Sending to role addresses is a known negative signal that many spam filters actively penalise.<\/p>\n<p>Shared mailboxes like partnerships@ or press@ often have even lower engagement. One person at the company marks your email as spam, and it counts as a complaint for the entire address. Remove all role-based and shared addresses from your cold email lists before sending.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"what-content-changes-actually-improve-email-deliverability\"><\/span>What Content Changes Actually Improve Email Deliverability?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-952 size-large\" src=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1-1024x757.webp\" alt=\"Side-by-side comparison of a spam-pattern email versus a clean cold email showing the content differences that affect deliverability\" width=\"1024\" height=\"757\" srcset=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1-1024x757.webp 1024w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1-300x222.webp 300w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1-768x568.webp 768w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1-450x333.webp 450w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1-780x576.webp 780w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1.webp 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>Content is not the primary driver of deliverability, but it is not irrelevant either. Spam filters do analyse your email body and subject line for patterns associated with low-quality or deceptive sending. The good news is that the content-level fixes are straightforward: avoid the obvious red flags and focus on writing emails that feel personal and relevant.<\/p>\n<p><strong>Fix #10: Avoid Spam Trigger Patterns in Subject Lines and Body Copy<\/strong><\/p>\n<p>Spam filters in 2024 are significantly more sophisticated than keyword-matching systems. They do not simply flag emails that contain the word &#8216;free&#8217; or &#8216;urgent.&#8217; They look at the ratio of text to HTML, the number of links relative to the content length, whether the email is formatted like a mass-marketing template, and whether the subject line contains deceptive or misleading language.<\/p>\n<p>Practical rules: keep your email mostly plain text for cold outreach. Limit links to one or two per email. Avoid excessive capitalisation in subject lines. Do not use misleading subject lines like &#8216;Re: our conversation&#8217; when there was no prior conversation. Do not include large images as a substitute for text. These patterns are strongly associated with mass spam campaigns and most inbox providers penalise them.<\/p>\n<p>For cold email specifically, short, plain, personalised emails deliver better than HTML-heavy marketing templates. Write like a human talking to a specific person, not like a brand sending a newsletter.<\/p>\n<p><strong>Fix #11: Set Up a Custom Tracking Domain<\/strong><\/p>\n<p>Most cold email tools include open and click tracking by default. The problem is that many tools route tracking through shared domains: links in your emails redirect through a domain that is shared with hundreds of other senders. If any of those other senders have poor sending practices, the shared tracking domain may be on a blacklist, and every email that routes through it inherits that negative signal.<\/p>\n<p>The fix is to set up a custom tracking domain: a subdomain of your sending domain (e.g., track.yoursendingdomain.com) that handles click and open tracking exclusively for your emails. This keeps your tracking reputation isolated from other senders and gives inbox providers a cleaner signal to evaluate.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"how-does-your-sending-behaviour-affect-inbox-placement\"><\/span>How Does Your Sending Behaviour Affect Inbox Placement?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-883 size-large\" src=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1024x683.webp\" alt=\"Email deliverability monitoring dashboard showing spam complaint rate, bounce rate, domain reputation, and inbox placement rate metrics\" width=\"1024\" height=\"683\" srcset=\"https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-1024x683.webp 1024w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-300x200.webp 300w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-768x512.webp 768w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-450x300.webp 450w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability-780x520.webp 780w, https:\/\/inboxwarm.ai\/blog\/wp-content\/uploads\/2026\/06\/What-Content-Changes-Actually-Improve-Email-Deliverability.webp 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>Even with perfect authentication, a clean list, and well-written emails, poor sending behaviour can undermine everything. Inbox providers watch how you send, not just what you send. Sudden volume spikes, inconsistent sending patterns, and ignoring bounce and complaint signals are all behaviours that damage domain reputation over time.<\/p>\n<p><strong>Fix #12: Send at a Consistent Volume and Pace<\/strong><\/p>\n<p>Sending 50 emails one day and 5,000 the next is one of the clearest signals that triggers spam filters. Inbox providers expect legitimate senders to have relatively consistent sending volumes. Sudden spikes look like compromised accounts or mass campaign launches, both of which are associated with spam.<\/p>\n<p>Keep your daily send volume consistent. If you need to scale up, do it gradually over days or weeks, not overnight. The same principle that applies to domain warm-up applies to ongoing sending behaviour: slow, steady, and consistent builds trust far more effectively than irregular bursts.<\/p>\n<p><strong>Fix #13: Time Your Sends for Maximum Engagement<\/strong><\/p>\n<p>Engagement rate is a direct input into inbox placement. Emails that get opened, replied to, and clicked on at a higher rate build positive reputation signals. Emails that sit unopened for days before being deleted or ignored build negative ones.<\/p>\n<p>Data consistently shows that B2B cold emails sent Tuesday through Thursday between 9am and 11am local time for the recipient get the highest open and reply rates. This is not a universal rule, but it is a strong baseline to start from. Test your own list to find your optimal sending window. Higher engagement rates mean better long-term inbox placement.<\/p>\n<p><strong>Fix #14: Monitor Deliverability Metrics and Respond Quickly<\/strong><\/p>\n<p>Most senders only look at open rates. But open rates are a lagging indicator: by the time your open rate drops, your deliverability has already been declining for days or weeks. The metrics you need to watch proactively are: spam complaint rate (via Google Postmaster Tools), hard bounce rate (per campaign), domain reputation score (Postmaster Tools and similar), and inbox placement rate (via a seed list tool or inbox testing service).<\/p>\n<p>Set up alerts. If your spam complaint rate crosses 0.08%, investigate immediately, before it reaches Google&#8217;s 0.10% warning threshold. If you see a spike in bounces from a particular domain, check whether that domain has changed its MX records or is filtering more aggressively. Fast response to early signals is what separates senders who maintain consistently high deliverability from those who are constantly in recovery mode. Use the InboxWarm <a href=\"https:\/\/inboxwarm.ai\/tools\/esp-checker\" target=\"_blank\" rel=\"noopener\">ESP Checker<\/a> to monitor how your sending infrastructure looks to major providers.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"what-is-the-priority-order-for-fixing-email-deliverability\"><\/span>What Is the Priority Order for Fixing Email Deliverability?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If you are starting from scratch or troubleshooting a deliverability problem, this is the order to work through. Fix infrastructure first. Then reputation. Then list quality. Then content and behaviour. Skipping ahead does not work: you cannot fix a reputation problem with better subject lines if your authentication records are still broken.<\/p>\n\n<table id=\"tablepress-81\" class=\"tablepress tablepress-id-81\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\"><span style=\"color: #ffffff; font-weight: bold;\">#<\/span><\/th><th class=\"column-2\"><span style=\"color: #ffffff; font-weight: bold;\">Fix<\/span><\/th><th class=\"column-3\"><span style=\"color: #ffffff; font-weight: bold;\">Impact<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"row-2\">\n\t<td class=\"column-1\">1<\/td><td class=\"column-2\">Set up SPF, DKIM, and DMARC<\/td><td class=\"column-3\">Critical: without this, nothing else works<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">2<\/td><td class=\"column-2\">Use a dedicated sending domain<\/td><td class=\"column-3\">High: protects your main domain from damage<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">3<\/td><td class=\"column-2\">Check and resolve blacklist listings<\/td><td class=\"column-3\">High: a listing can tank placement across providers<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">4<\/td><td class=\"column-2\">Warm up new domains before campaigns<\/td><td class=\"column-3\">Critical: new domains have zero default trust<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">5<\/td><td class=\"column-2\">Keep spam complaint rate below 0.10%<\/td><td class=\"column-3\">Critical: enforced by Google and Yahoo<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">6<\/td><td class=\"column-2\">Never use purchased or unverified lists<\/td><td class=\"column-3\">High: spam traps destroy domain reputation fast<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">7<\/td><td class=\"column-2\">Verify email addresses before every send<\/td><td class=\"column-3\">High: bounce rate above 2% signals poor hygiene<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">8<\/td><td class=\"column-2\">Suppress low-engagement contacts<\/td><td class=\"column-3\">Medium: low engagement drags down domain reputation<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">9<\/td><td class=\"column-2\">Remove role-based email addresses<\/td><td class=\"column-3\">Medium: high complaint rate, low engagement<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">10<\/td><td class=\"column-2\">Avoid spam trigger content patterns<\/td><td class=\"column-3\">Medium: content is not primary but is still a signal<\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-1\">11<\/td><td class=\"column-2\">Set up a custom tracking domain<\/td><td class=\"column-3\">Medium: isolates your tracking reputation<\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-1\">12<\/td><td class=\"column-2\">Send at consistent daily volumes<\/td><td class=\"column-3\">Medium: volume spikes trigger spam filter scrutiny<\/td>\n<\/tr>\n<tr class=\"row-14\">\n\t<td class=\"column-1\">13<\/td><td class=\"column-2\">Time sends for peak engagement windows<\/td><td class=\"column-3\">Low to Medium: higher engagement builds reputation<\/td>\n<\/tr>\n<tr class=\"row-15\">\n\t<td class=\"column-1\">14<\/td><td class=\"column-2\">Monitor metrics and respond to early signals<\/td><td class=\"column-3\">High: fast response prevents reputation decay<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-81 from cache -->\n<div style=\"background-color: #0e3e5d; color: #ffffff; padding: 40px; border-radius: 10px; margin: 40px 0; font-family: sans-serif;\">\n<h2 style=\"color: #ffffff; margin-top: 0; margin-bottom: 20px;\"><span class=\"ez-toc-section\" id=\"fixed-your-authentication-the-next-step-is-warming-up-your-domain\"><\/span>Fixed your authentication? The next step is warming up your domain.<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"margin-bottom: 20px; color: #e0e0e0;\">InboxWarm.ai automates email warm-up across all your sending domains, building the sender reputation that determines where your authenticated emails actually land.<\/p>\n<p><a class=\"generic-btn-wrap\" style=\"color: #ffffff; text-decoration: none; font-weight: bold;\" href=\"https:\/\/app.inboxwarm.ai\/users\/sign_up\" target=\"_blank\" rel=\"noopener\">\u2605 Start your free trial today.<\/a><\/p>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<style>#sp-ea-881 .spcollapsing { height: 0; overflow: hidden; transition-property: height;transition-duration: 300ms;}#sp-ea-881.sp-easy-accordion>.sp-ea-single {margin-bottom: 10px; border: 1px solid #e2e2e2; }#sp-ea-881.sp-easy-accordion>.sp-ea-single>.ea-header a {color: #444;}#sp-ea-881.sp-easy-accordion>.sp-ea-single>.sp-collapse>.ea-body {background: #fff; color: #444;}#sp-ea-881.sp-easy-accordion>.sp-ea-single {background: #eee;}#sp-ea-881.sp-easy-accordion>.sp-ea-single>.ea-header a .ea-expand-icon { float: left; color: #444;font-size: 16px;}<\/style><div id=\"sp_easy_accordion-1781246186\"><div id=\"sp-ea-881\" class=\"sp-ea-one sp-easy-accordion\" data-ea-active=\"ea-click\" data-ea-mode=\"vertical\" data-preloader=\"\" data-scroll-active-item=\"\" data-offset-to-scroll=\"0\"><div class=\"ea-card ea-expand sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8810\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8810\" aria-controls=\"collapse8810\" href=\"#\" aria-expanded=\"true\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-minus\"><\/i> What Is the Difference Between Email Delivery and Email Deliverability?<\/a><\/h3><div class=\"sp-collapse spcollapse collapsed show\" id=\"collapse8810\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8810\"> <div class=\"ea-body\"><p>Email delivery means the receiving server accepted your email and did not return a bounce. Email deliverability means the email reached the primary inbox rather than spam or another folder. An email can be delivered and still never be seen. Deliverability is the metric that actually matters for outreach.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8811\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8811\" aria-controls=\"collapse8811\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How Long Does It Take to Improve Email Deliverability?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse8811\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8811\"> <div class=\"ea-body\"><p>Quick wins like fixing authentication records and removing blacklist listings can show results within 48 to 72 hours. Reputation improvements take longer: typically two to six weeks of clean sending behaviour before a damaged domain's inbox placement rates recover meaningfully. New domain warm-up usually takes four to eight weeks to reach full sending capacity.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8812\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8812\" aria-controls=\"collapse8812\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Does a Low Open Rate Mean Bad Deliverability?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse8812\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8812\"> <div class=\"ea-body\"><p>Not necessarily. Low open rates can result from poor targeting, weak subject lines, or emailing the wrong audience at the wrong time. But if your open rate drops suddenly or significantly, it is often a symptom of a deliverability problem: your emails are reaching the spam folder, where recipients rarely look. Check your inbox placement directly with a seed list or testing tool before assuming the problem is content.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8813\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8813\" aria-controls=\"collapse8813\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What Is a Good Inbox Placement Rate?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse8813\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8813\"> <div class=\"ea-body\"><p>For cold email, a strong inbox placement rate is above 85% to 90% to the primary inbox. Below 80% is a clear signal that something in your deliverability setup needs attention. Below 70% means there is likely an infrastructure or reputation problem that needs to be resolved before running any campaigns.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8814\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8814\" aria-controls=\"collapse8814\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Can Email Warm-Up Actually Recover a Damaged Domain?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse8814\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8814\"> <div class=\"ea-body\"><p>Yes, in most cases. If the domain has not been permanently blacklisted, a structured warm-up process that generates clean, positive engagement signals can rebuild sender reputation over four to eight weeks. The key is addressing the root cause of the damage first: fixing authentication, cleaning the list, resolving blacklist listings. Warm-up on a broken foundation does not work. <\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8815\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8815\" aria-controls=\"collapse8815\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> How Often Should You Clean Your Email List?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse8815\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8815\"> <div class=\"ea-body\"><p>At minimum, remove hard bounces within 24 hours of every campaign. Run a full list verification pass before any campaign sent to a list that has not been mailed in 60 days or more. Suppress low-engagement contacts every 90 days. For cold email agencies managing multiple client lists, build list hygiene into every campaign setup workflow rather than treating it as a periodic task.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8816\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8816\" aria-controls=\"collapse8816\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Does Sending From Multiple Domains Help or Hurt Deliverability?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse8816\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8816\"> <div class=\"ea-body\"><p>Using multiple sending domains is a legitimate strategy for scaling cold email volume while distributing risk. Each domain has its own reputation, so a problem on one domain does not affect the others. The condition is that every domain must be properly authenticated, individually warmed up, and managed with the same sending hygiene as your primary domain. Multiple poorly managed domains multiply the problem rather than solving it.<\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><a class=\"collapsed\" id=\"ea-header-8817\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse8817\" aria-controls=\"collapse8817\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What Is the Fastest Way to Fix Email Deliverability?<\/a><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse8817\" data-parent=\"#sp-ea-881\" role=\"region\" aria-labelledby=\"ea-header-8817\"> <div class=\"ea-body\"><p>Check your authentication records first. Use the free InboxWarm <a href=\"https:\/\/inboxwarm.ai\/tools\/spf-checker\" target=\"_blank\" rel=\"noopener\">SPF Checker<\/a>, <a href=\"https:\/\/inboxwarm.ai\/tools\/dkim-checker\" target=\"_blank\" rel=\"noopener\">DKIM Checker<\/a>, and <a href=\"https:\/\/inboxwarm.ai\/tools\/dmarc-checker\" target=\"_blank\" rel=\"noopener\">DMARC Checker<\/a> to see whether your records are valid and correctly resolving. Then check for blacklist listings. Then review your last campaign's bounce and complaint rates. In most cases, the fix for 80% of deliverability problems is in those three places.<\/p><\/div><\/div><\/div><\/div><\/div>\n<h2><span class=\"ez-toc-section\" id=\"final-thoughts\"><\/span>Final Thoughts<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Email deliverability is not a mystery. It is a system, and like any system, it responds predictably when you fix the right things in the right order. Authentication comes first: without it, you are sending as an unknown entity, and inbox providers will treat you like one.<\/p>\n<p>Domain reputation comes second: it is built through consistent, clean sending behaviour, not through clever copy or technical tricks. List hygiene and content quality come after that: they matter, but they cannot compensate for broken infrastructure or a damaged reputation.<\/p>\n<p>Work through the 14 fixes in this guide from the top down. Use the free InboxWarm tools to verify your authentication records, check your blacklist status, and monitor your infrastructure as you go. If you are starting with a new sending domain or recovering from a deliverability incident, run a structured warm-up process before launching campaigns.<\/p>\n<p>Get the infrastructure right. Build the reputation. Then trust the process. Your emails will reach the inbox, and when they do, the quality of your outreach is what takes over. That is the only order that works.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>TL;DR Email deliverability is not about writing better subject lines. It is about how inbox providers evaluate your domain, your infrastructure, and your sending behaviour. The 14 fixes in this guide cover authentication, domain reputation, list hygiene, content signals, sending patterns, and warm-up, in the order that actually moves the needle. Most deliverability problems are [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":884,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[24],"tags":[],"class_list":["post-880","post","type-post","status-publish","format-standard","has-post-thumbnail","category-email-deliverability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Improve Email Deliverability: 14 Fixes That Actually Work<\/title>\n<meta name=\"description\" content=\"Struggling with emails landing in spam? 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