{"id":4689,"date":"2026-02-07T16:02:33","date_gmt":"2026-02-07T13:02:33","guid":{"rendered":"https:\/\/www.dchost.com\/blog\/email-deliverability-audit-checklist-dns-reputation-content-and-logs\/"},"modified":"2026-02-07T16:02:33","modified_gmt":"2026-02-07T13:02:33","slug":"email-deliverability-audit-checklist-dns-reputation-content-and-logs","status":"publish","type":"post","link":"https:\/\/www.dchost.com\/blog\/en\/email-deliverability-audit-checklist-dns-reputation-content-and-logs\/","title":{"rendered":"Email Deliverability Audit Checklist: DNS, Reputation, Content and Logs"},"content":{"rendered":"<div class=\"dchost-blog-content-wrapper\"><p>Email delivery problems rarely come from a single cause. In real audits we run for dchost.com customers, poor inbox placement is almost always a mix of DNS gaps, weak IP reputation, content that annoys filters, and quiet error signals hiding in SMTP logs. The good news: if you approach it as a structured audit instead of random tweaks, you can usually turn a struggling sender around in a matter of weeks. In this guide, I\u2019ll walk you through a practical email deliverability audit checklist you can reuse for your own domains, whether you\u2019re sending from shared hosting, a <a href=\"https:\/\/www.dchost.com\/vps\">VPS<\/a>, a <a href=\"https:\/\/www.dchost.com\/dedicated-server\">dedicated server<\/a> or a hybrid setup. We\u2019ll focus on four pillars: DNS records, IP and domain reputation, content and sending practices, and finally log and bounce analysis. Treat this as a repeatable playbook you can run quarterly, or any time you see open rates drop, complaint rates rise, or important transactional emails start disappearing.<\/p>\n<div id=\"toc_container\" class=\"toc_transparent no_bullets\"><p class=\"toc_title\">\u0130&ccedil;indekiler<\/p><ul class=\"toc_list\"><li><a href=\"#1_Start_With_a_Clear_Map_of_Your_Email_Infrastructure\"><span class=\"toc_number toc_depth_1\">1<\/span> 1. Start With a Clear Map of Your Email Infrastructure<\/a><ul><li><a href=\"#11_List_all_sending_domains_and_subdomains\"><span class=\"toc_number toc_depth_2\">1.1<\/span> 1.1 List all sending domains and subdomains<\/a><\/li><li><a href=\"#12_Separate_transactional_and_marketing_traffic\"><span class=\"toc_number toc_depth_2\">1.2<\/span> 1.2 Separate transactional and marketing traffic<\/a><\/li><li><a href=\"#13_Capture_current_performance_baselines\"><span class=\"toc_number toc_depth_2\">1.3<\/span> 1.3 Capture current performance baselines<\/a><\/li><\/ul><\/li><li><a href=\"#2_DNS_Records_Checklist_SPF_DKIM_DMARC_and_Friends\"><span class=\"toc_number toc_depth_1\">2<\/span> 2. DNS Records Checklist: SPF, DKIM, DMARC and Friends<\/a><ul><li><a href=\"#21_SPF_Sender_Policy_Framework\"><span class=\"toc_number toc_depth_2\">2.1<\/span> 2.1 SPF (Sender Policy Framework)<\/a><\/li><li><a href=\"#22_DKIM_DomainKeys_Identified_Mail\"><span class=\"toc_number toc_depth_2\">2.2<\/span> 2.2 DKIM (DomainKeys Identified Mail)<\/a><\/li><li><a href=\"#23_DMARC_Domain-based_Message_Authentication_Reporting_and_Conformance\"><span class=\"toc_number toc_depth_2\">2.3<\/span> 2.3 DMARC (Domain-based Message Authentication, Reporting and Conformance)<\/a><\/li><li><a href=\"#24_Reverse_DNS_PTR_and_HELOEHLO\"><span class=\"toc_number toc_depth_2\">2.4<\/span> 2.4 Reverse DNS (PTR) and HELO\/EHLO<\/a><\/li><li><a href=\"#25_Advanced_DNS_MTASTS_TLSRPT_BIMI_and_DNSSEC_optional_but_valuable\"><span class=\"toc_number toc_depth_2\">2.5<\/span> 2.5 Advanced DNS: MTA\u2011STS, TLS\u2011RPT, BIMI and DNSSEC (optional but valuable)<\/a><\/li><\/ul><\/li><li><a href=\"#3_IP_and_Domain_Reputation_How_the_World_Sees_Your_Mail\"><span class=\"toc_number toc_depth_1\">3<\/span> 3. IP and Domain Reputation: How the World Sees Your Mail<\/a><ul><li><a href=\"#31_Shared_vs_dedicated_IPs\"><span class=\"toc_number toc_depth_2\">3.1<\/span> 3.1 Shared vs dedicated IPs<\/a><\/li><li><a href=\"#32_Check_major_blocklists_and_reputation_sources\"><span class=\"toc_number toc_depth_2\">3.2<\/span> 3.2 Check major blocklists and reputation sources<\/a><\/li><li><a href=\"#33_Analyse_engagement_and_complaint_patterns\"><span class=\"toc_number toc_depth_2\">3.3<\/span> 3.3 Analyse engagement and complaint patterns<\/a><\/li><li><a href=\"#34_IP_warmup_and_volume_consistency\"><span class=\"toc_number toc_depth_2\">3.4<\/span> 3.4 IP warmup and volume consistency<\/a><\/li><\/ul><\/li><li><a href=\"#4_Content_and_Sending_Practices_Surviving_the_Filters\"><span class=\"toc_number toc_depth_1\">4<\/span> 4. Content and Sending Practices: Surviving the Filters<\/a><ul><li><a href=\"#41_Verify_basic_message_headers\"><span class=\"toc_number toc_depth_2\">4.1<\/span> 4.1 Verify basic message headers<\/a><\/li><li><a href=\"#42_Check_HTML_quality_and_texttoimage_balance\"><span class=\"toc_number toc_depth_2\">4.2<\/span> 4.2 Check HTML quality and text\u2011to\u2011image balance<\/a><\/li><li><a href=\"#43_List_hygiene_and_consent\"><span class=\"toc_number toc_depth_2\">4.3<\/span> 4.3 List hygiene and consent<\/a><\/li><li><a href=\"#44_Avoid_common_trigger_patterns\"><span class=\"toc_number toc_depth_2\">4.4<\/span> 4.4 Avoid common trigger patterns<\/a><\/li><li><a href=\"#45_Sending_frequency_and_cadence\"><span class=\"toc_number toc_depth_2\">4.5<\/span> 4.5 Sending frequency and cadence<\/a><\/li><\/ul><\/li><li><a href=\"#5_Log_and_Bounce_Analysis_Listening_to_Your_Mail_Server\"><span class=\"toc_number toc_depth_1\">5<\/span> 5. Log and Bounce Analysis: Listening to Your Mail Server<\/a><ul><li><a href=\"#51_Understand_SMTP_status_and_bounce_codes\"><span class=\"toc_number toc_depth_2\">5.1<\/span> 5.1 Understand SMTP status and bounce codes<\/a><\/li><li><a href=\"#52_Review_MTA_logs_on_your_hosting_or_VPS\"><span class=\"toc_number toc_depth_2\">5.2<\/span> 5.2 Review MTA logs on your hosting or VPS<\/a><\/li><li><a href=\"#53_Track_acceptance_vs_delivery_vs_engagement\"><span class=\"toc_number toc_depth_2\">5.3<\/span> 5.3 Track acceptance vs delivery vs engagement<\/a><\/li><li><a href=\"#54_Automated_monitoring_and_alerts\"><span class=\"toc_number toc_depth_2\">5.4<\/span> 5.4 Automated monitoring and alerts<\/a><\/li><\/ul><\/li><li><a href=\"#6_Turn_the_Audit_Into_a_Repeatable_Checklist\"><span class=\"toc_number toc_depth_1\">6<\/span> 6. Turn the Audit Into a Repeatable Checklist<\/a><ul><li><a href=\"#61_Define_frequencies_for_each_check\"><span class=\"toc_number toc_depth_2\">6.1<\/span> 6.1 Define frequencies for each check<\/a><\/li><li><a href=\"#62_Assign_clear_ownership\"><span class=\"toc_number toc_depth_2\">6.2<\/span> 6.2 Assign clear ownership<\/a><\/li><li><a href=\"#63_Document_your_baseline_and_improvements\"><span class=\"toc_number toc_depth_2\">6.3<\/span> 6.3 Document your baseline and improvements<\/a><\/li><\/ul><\/li><li><a href=\"#Bringing_It_All_Together_and_What_to_Do_Next\"><span class=\"toc_number toc_depth_1\">7<\/span> Bringing It All Together (and What to Do Next)<\/a><\/li><\/ul><\/div>\n<h2><span id=\"1_Start_With_a_Clear_Map_of_Your_Email_Infrastructure\">1. Start With a Clear Map of Your Email Infrastructure<\/span><\/h2>\n<p>Before touching DNS or content, you need a precise picture of <strong>what is sending email for your domain today<\/strong>. Most deliverability issues come from something you forgot was sending on your behalf.<\/p>\n<h3><span id=\"11_List_all_sending_domains_and_subdomains\">1.1 List all sending domains and subdomains<\/span><\/h3>\n<p>Make an inventory of every domain and subdomain involved in email:<\/p>\n<ul>\n<li>Primary domain (example.com)<\/li>\n<li>Transactional subdomains (e.g. mail.example.com, billing.example.com)<\/li>\n<li>Marketing subdomains (e.g. newsletter.example.com, updates.example.com)<\/li>\n<li>Legacy or forgotten brands still using your IPs or DNS<\/li>\n<\/ul>\n<p>For each domain or subdomain, note:<\/p>\n<ul>\n<li>Where its DNS is hosted (our DNS, registrar DNS, third-party)<\/li>\n<li>Which server or service is actually sending (your cPanel, a VPS, an application server, or an external platform)<\/li>\n<li>Whether it sends transactional, marketing, or internal\/IT notifications<\/li>\n<\/ul>\n<h3><span id=\"12_Separate_transactional_and_marketing_traffic\">1.2 Separate transactional and marketing traffic<\/span><\/h3>\n<p>If you send both transactional emails (password resets, order confirmations) and bulk marketing campaigns, mixing them on the same IP and domain increases risk. A poor campaign can damage the deliverability of critical system messages.<\/p>\n<p>As part of your audit, decide whether you need:<\/p>\n<ul>\n<li>A dedicated sending subdomain for marketing (e.g. newsletter.example.com)<\/li>\n<li>A separate subdomain or even domain for high\u2011volume transactional mail<\/li>\n<li>Completely separate IPs for bulk vs critical traffic on your VPS or dedicated server<\/li>\n<\/ul>\n<p>We explain the strategic side of this in detail in our guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/e-posta-icin-ayri-gonderim-alan-adi-kullanmak-transactional-ve-pazarlama-e-postalari-icin-dogru-domain-ve-dns-stratejisi\/\">using separate sending domains for transactional and marketing emails<\/a>. Your audit should at least confirm that your most important emails are not sharing an IP with risky, low\u2011engagement campaigns.<\/p>\n<h3><span id=\"13_Capture_current_performance_baselines\">1.3 Capture current performance baselines<\/span><\/h3>\n<p>Before you change anything, capture today\u2019s metrics so you can judge improvement:<\/p>\n<ul>\n<li>Average open rate by campaign type<\/li>\n<li>Spam folder placement (using test accounts at major mailbox providers)<\/li>\n<li>Hard bounce rate and soft bounce rate<\/li>\n<li>Complaint rate (abuse reports) if your sending solution exposes it<\/li>\n<\/ul>\n<p>These numbers become your benchmark for the rest of the audit.<\/p>\n<h2><span id=\"2_DNS_Records_Checklist_SPF_DKIM_DMARC_and_Friends\">2. DNS Records Checklist: SPF, DKIM, DMARC and Friends<\/span><\/h2>\n<p>Mailbox providers treat your DNS zone as the \u201csource of truth\u201d about who is allowed to send for your domain and how they should verify that mail. Even one broken record can drag down deliverability.<\/p>\n<h3><span id=\"21_SPF_Sender_Policy_Framework\">2.1 SPF (Sender Policy Framework)<\/span><\/h3>\n<p>SPF tells recipients \u201cthese servers are allowed to send on behalf of this domain\u201d. In your audit, check:<\/p>\n<ul>\n<li><strong>Presence:<\/strong> Is there exactly one SPF TXT record for each sending domain?<\/li>\n<li><strong>Content:<\/strong> Does it include all real senders (your hosting server, third\u2011party tools, CRM, etc.)?<\/li>\n<li><strong>Syntax:<\/strong> Does it end with <code>~all<\/code> or <code>-all<\/code> and pass an online SPF validator?<\/li>\n<li><strong>Lookup count:<\/strong> Are you under the 10 DNS lookup limit (includes <code>include:<\/code>, <code>a<\/code>, <code>mx<\/code>, etc.)?<\/li>\n<\/ul>\n<p>If you\u2019re using many providers, SPF records can easily hit that 10\u2011lookup wall. In that case, consider SPF \u201cflattening\u201d or consolidating providers. We cover advanced techniques for this in our article on <a href=\"https:\/\/www.dchost.com\/blog\/en\/gelismis-spf-yonetimi-10-dns-lookup-limitine-takilmadan-coklu-e-posta-servisi-kullanmak\/\">advanced SPF management for multiple email providers<\/a>.<\/p>\n<h3><span id=\"22_DKIM_DomainKeys_Identified_Mail\">2.2 DKIM (DomainKeys Identified Mail)<\/span><\/h3>\n<p>DKIM attaches a cryptographic signature to each email so recipients can confirm that the content wasn\u2019t altered and that it really came from a domain that controls the matching private key.<\/p>\n<p>Your DKIM audit checklist:<\/p>\n<ul>\n<li><strong>Enabled per sender:<\/strong> For each system that sends mail, confirm DKIM is turned on.<\/li>\n<li><strong>Key length:<\/strong> Use at least 1024\u2011bit keys; 2048 is preferred for new setups.<\/li>\n<li><strong>Selector hygiene:<\/strong> Use clear selectors per system (e.g. <code>vps2025._domainkey.example.com<\/code>).<\/li>\n<li><strong>Alignment:<\/strong> The <code>d=<\/code> domain in DKIM should match or be a subdomain of your visible From domain to help DMARC.<\/li>\n<\/ul>\n<h3><span id=\"23_DMARC_Domain-based_Message_Authentication_Reporting_and_Conformance\">2.3 DMARC (Domain-based Message Authentication, Reporting and Conformance)<\/span><\/h3>\n<p>DMARC sits on top of SPF and DKIM and tells recipients what to do when messages fail authentication, plus where to send reports. Many organisations add a DMARC record with a relaxed policy and never look at it again; a good audit corrects that.<\/p>\n<p>Check these DMARC aspects:<\/p>\n<ul>\n<li><strong>Record existence:<\/strong> Is there a <code>_dmarc.example.com<\/code> TXT record?<\/li>\n<li><strong>Policy:<\/strong> Are you still at <code>p=none<\/code> (monitoring only), or have you moved towards <code>quarantine<\/code> or <code>reject<\/code>?<\/li>\n<li><strong>Reporting:<\/strong> Does <code>rua=<\/code> point to a mailbox you actually read or a DMARC reporting tool?<\/li>\n<li><strong>Alignment mode:<\/strong> Are you using relaxed (<code>adkim= r<\/code>, <code>aspf= r<\/code>) or strict alignment, and does that match your domain architecture?<\/li>\n<\/ul>\n<p>We go deeper into the value of reports (not just the record) in our article <a href=\"https:\/\/www.dchost.com\/blog\/en\/dmarc-raporlari-aggregate-ve-forensic-analiz-ile-pnonedan-prejecte-gecis\/\">DMARC in context: why the reports matter more than the record<\/a>. During your audit, at minimum verify you\u2019re receiving and reviewing DMARC aggregate reports.<\/p>\n<h3><span id=\"24_Reverse_DNS_PTR_and_HELOEHLO\">2.4 Reverse DNS (PTR) and HELO\/EHLO<\/span><\/h3>\n<p>If you send from your own VPS or dedicated server, reverse DNS (PTR) is non\u2011negotiable. Many providers simply won\u2019t trust mail from an IP without a correct PTR.<\/p>\n<ul>\n<li>Ensure the IP\u2019s PTR resolves to a hostname you control, such as <code>mail.example.com<\/code>.<\/li>\n<li>Ensure that hostname has an A record pointing back to the same IP (forward\u2011reverse consistency).<\/li>\n<li>Configure your MTA (Postfix, Exim, etc.) so its HELO\/EHLO name matches that hostname.<\/li>\n<\/ul>\n<p>For a deeper dive into why PTR matters, see our explanation of <a href=\"https:\/\/www.dchost.com\/blog\/en\/ptr-reverse-dns-kaydi-vps-ipniz-icin-dogru-ayar-ve-e-posta-teslimine-etkisi\/\">what a PTR (reverse DNS) record is and how it affects email delivery<\/a>.<\/p>\n<h3><span id=\"25_Advanced_DNS_MTASTS_TLSRPT_BIMI_and_DNSSEC_optional_but_valuable\">2.5 Advanced DNS: MTA\u2011STS, TLS\u2011RPT, BIMI and DNSSEC (optional but valuable)<\/span><\/h3>\n<p>Once SPF, DKIM, DMARC and PTR are correct, advanced DNS records can add extra trust and security:<\/p>\n<ul>\n<li><strong>MTA\u2011STS:<\/strong> Enforces TLS for inbound mail to your domain.<\/li>\n<li><strong>TLS\u2011RPT:<\/strong> Lets receivers send you reports when TLS delivery fails.<\/li>\n<li><strong>BIMI:<\/strong> Helps display your brand logo in some inboxes when DMARC is strong.<\/li>\n<li><strong>DNSSEC:<\/strong> Protects DNS responses from tampering, indirectly boosting trust.<\/li>\n<\/ul>\n<p>We summarise these in our article on <a href=\"https:\/\/www.dchost.com\/blog\/en\/mta-sts-tls-rpt-ve-bimi-nedir-e-posta-guvenligi-ve-marka-gorunurlugu-icin-gelismis-dns-ayarlari\/\">MTA\u2011STS, TLS\u2011RPT and BIMI for email security and brand visibility<\/a>. For an audit, it\u2019s enough to record which of these you already use and whether their policies are valid.<\/p>\n<h2><span id=\"3_IP_and_Domain_Reputation_How_the_World_Sees_Your_Mail\">3. IP and Domain Reputation: How the World Sees Your Mail<\/span><\/h2>\n<p>DNS tells recipients who <em>should<\/em> be sending; reputation tells them how your past behaviour actually looks. A clean technical setup can still perform badly if IPs and domains have a poor history.<\/p>\n<h3><span id=\"31_Shared_vs_dedicated_IPs\">3.1 Shared vs dedicated IPs<\/span><\/h3>\n<p>On shared hosting, your domain may share an outbound IP with many others. That can be fine when your provider actively manages abuse, but it also means your reputation is partly outside your control.<\/p>\n<p>As part of your audit, note for each sending stream:<\/p>\n<ul>\n<li>Is it on a shared IP, dedicated IP, or a pool managed by an external sender?<\/li>\n<li>Does that IP send only your mail, or also other customers\u2019 traffic?<\/li>\n<li>Are there signs of past abuse or blocklisting on that IP?<\/li>\n<\/ul>\n<p>For high\u2011volume or high\u2011value transactional emails, a dedicated IP on a well\u2011configured VPS or dedicated server from dchost.com often makes reputation management easier. Our guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/dedicated-ip-isitma-ve-e-posta-itibari-yonetimi\/\">dedicated IP warmup and email reputation management<\/a> explains how to ramp up that IP safely.<\/p>\n<h3><span id=\"32_Check_major_blocklists_and_reputation_sources\">3.2 Check major blocklists and reputation sources<\/span><\/h3>\n<p>Next, run your sending IPs and domains through reputable blocklist and reputation checkers. In your audit notes, record:<\/p>\n<ul>\n<li>Which IPs are currently on any real\u2011time blocklists (RBLs)<\/li>\n<li>Which domains show up on domain\u2011based blacklists<\/li>\n<li>Any \u201cpoor\u201d reputation signals from large mailbox providers\u2019 postmaster tools (if available)<\/li>\n<\/ul>\n<p>If you discover listings, don\u2019t rush to delist without understanding <em>why<\/em> you were listed. A good audit identifies the root cause: spam complaints, compromised accounts, a misconfigured script, or an old newsletter list imported without consent. Our article <a href=\"https:\/\/www.dchost.com\/blog\/en\/e-posta-itibarini-kurtarma-rehberi-blacklist-delisting-postmaster-araclari-ve-guvenli-ip-isitma-nasil-kurtarici-olur\/\">stuck on a blocklist? email sender reputation recovery<\/a> walks through a calm, methodical recovery playbook.<\/p>\n<h3><span id=\"33_Analyse_engagement_and_complaint_patterns\">3.3 Analyse engagement and complaint patterns<\/span><\/h3>\n<p>Mailbox providers heavily weigh user engagement:<\/p>\n<ul>\n<li>Opens and clicks (positive signals)<\/li>\n<li>Deletes without opening (neutral to negative)<\/li>\n<li>\u201cThis is spam\u201d complaints (strongly negative)<\/li>\n<\/ul>\n<p>Within your audit, split these metrics at least by:<\/p>\n<ul>\n<li>Transactional vs marketing streams<\/li>\n<li>New subscribers vs long\u2011time subscribers<\/li>\n<li>Country or region if you have a global audience<\/li>\n<\/ul>\n<p>If one segment generates most complaints or bounces, that\u2019s where you need to focus list hygiene and content changes.<\/p>\n<h3><span id=\"34_IP_warmup_and_volume_consistency\">3.4 IP warmup and volume consistency<\/span><\/h3>\n<p>Sudden spikes in volume from a relatively new IP are a classic trigger for extra scrutiny. Your audit should answer:<\/p>\n<ul>\n<li>Did we recently change IPs, hosting, or email infrastructure?<\/li>\n<li>Did sending volume jump sharply in the last 30\u201360 days?<\/li>\n<li>Are we sending at oddly low volumes for long periods, then big bursts for campaigns?<\/li>\n<\/ul>\n<p>If yes, you may need a warmup or re\u2011warmup plan: gradually increasing volume, prioritising the most engaged recipients first, and avoiding large sends to cold, unengaged lists.<\/p>\n<h2><span id=\"4_Content_and_Sending_Practices_Surviving_the_Filters\">4. Content and Sending Practices: Surviving the Filters<\/span><\/h2>\n<p>Once the technical foundation is sound, content and list practices become the main lever. Filters look at far more than \u201cspammy words\u201d; they evaluate how people react to your messages over time.<\/p>\n<h3><span id=\"41_Verify_basic_message_headers\">4.1 Verify basic message headers<\/span><\/h3>\n<p>During the audit, pick live samples from each sending source and inspect their headers:<\/p>\n<ul>\n<li><strong>From:<\/strong> Is the visible sender clear, consistent and recognisable to your users?<\/li>\n<li><strong>Reply\u2011To:<\/strong> Does it point to a monitored mailbox?<\/li>\n<li><strong>DKIM\u2011Signature:<\/strong> Is there a valid DKIM header with your domain?<\/li>\n<li><strong>List\u2011Unsubscribe:<\/strong> Is there a one\u2011click unsubscribe header for bulk emails?<\/li>\n<li><strong>Message\u2011ID:<\/strong> Is it properly formatted and unique per message?<\/li>\n<\/ul>\n<h3><span id=\"42_Check_HTML_quality_and_texttoimage_balance\">4.2 Check HTML quality and text\u2011to\u2011image balance<\/span><\/h3>\n<p>Low\u2011quality HTML can hurt you even if your content is otherwise legitimate. Review sample emails for:<\/p>\n<ul>\n<li>Malformed or nested tags copied from visual editors<\/li>\n<li>Overly heavy templates with 100% image\u2011based content and almost no text<\/li>\n<li>Hard\u2011coded tracking domains that don\u2019t support HTTPS<\/li>\n<li>Broken external asset links that might trigger warnings<\/li>\n<\/ul>\n<p>A simple rule of thumb we use in audits: aim for a readable plain\u2011text alternative part, and ensure the HTML part would still make sense if images were disabled.<\/p>\n<h3><span id=\"43_List_hygiene_and_consent\">4.3 List hygiene and consent<\/span><\/h3>\n<p>Many reputation problems start with how addresses are added to your list, not with the content itself. Your audit should answer:<\/p>\n<ul>\n<li>Do we use double opt\u2011in for newsletters and promotions?<\/li>\n<li>Are old, inactive addresses automatically suppressed after repeated non\u2011engagement?<\/li>\n<li>Do we regularly remove hard bounces and long\u2011term soft bounces?<\/li>\n<li>Is there a straightforward unsubscribe link in <em>every<\/em> bulk email?<\/li>\n<\/ul>\n<p>Cleaning a heavily abused list can feel painful in the short term (fewer contacts), but it almost always improves deliverability and engagement, especially on shared IPs.<\/p>\n<h3><span id=\"44_Avoid_common_trigger_patterns\">4.4 Avoid common trigger patterns<\/span><\/h3>\n<p>Modern filters are smarter than simple keyword lists, but certain patterns still raise flags:<\/p>\n<ul>\n<li>Deceptive subject lines that don\u2019t match the content<\/li>\n<li>Overuse of urgent language, all\u2011caps, or excessive punctuation<\/li>\n<li>Large attachments (especially archives or executables) in marketing emails<\/li>\n<li>Links that display one domain but redirect to another unrelated site<\/li>\n<\/ul>\n<p>Use reputation\u2011friendly defaults: clear, honest subject lines, consistent branding, and landing pages that match what the email promised.<\/p>\n<h3><span id=\"45_Sending_frequency_and_cadence\">4.5 Sending frequency and cadence<\/span><\/h3>\n<p>Even well\u2011crafted emails can get filtered if you send them at the wrong pace. As part of the audit, examine:<\/p>\n<ul>\n<li>How often each segment receives campaigns (too often vs too rarely)<\/li>\n<li>Whether you send at the same local times each day\/week, or in chaotic bursts<\/li>\n<li>Whether you change sender name or From address too often, confusing subscribers<\/li>\n<\/ul>\n<p>A steady, predictable cadence helps filters build a consistent profile for your traffic. It also helps your infrastructure (and your dchost.com server resources) handle peaks more gracefully.<\/p>\n<h2><span id=\"5_Log_and_Bounce_Analysis_Listening_to_Your_Mail_Server\">5. Log and Bounce Analysis: Listening to Your Mail Server<\/span><\/h2>\n<p>Logs and bounce messages are where recipients tell you, often very precisely, what\u2019s going wrong. Skipping this step is like ignoring error messages in application logs when debugging a bug.<\/p>\n<h3><span id=\"51_Understand_SMTP_status_and_bounce_codes\">5.1 Understand SMTP status and bounce codes<\/span><\/h3>\n<p>Start by making sure your team is comfortable reading SMTP responses. At minimum, distinguish:<\/p>\n<ul>\n<li><strong>2xx:<\/strong> Success (message accepted)<\/li>\n<li><strong>4xx:<\/strong> Temporary issues (deferrals, greylisting, rate limiting)<\/li>\n<li><strong>5xx:<\/strong> Permanent failures (invalid recipient, policy blocks, spam rejections)<\/li>\n<\/ul>\n<p>Our guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/e-posta-hata-kodlarini-anlamak-550-554-421-ve-bounce-mesajlarini-cozmek\/\">understanding email bounce codes like 550, 554 and 421<\/a> explains how to interpret the most common ones and what action each implies. For a more SMTP\u2011level view, we also cover 4xx\u20135xx patterns in our article on <a href=\"https:\/\/www.dchost.com\/blog\/en\/smtp-hata-kodlari-ve-bounce-mesajlari-rehberi\/\">SMTP error codes and bounce messages<\/a>.<\/p>\n<h3><span id=\"52_Review_MTA_logs_on_your_hosting_or_VPS\">5.2 Review MTA logs on your hosting or VPS<\/span><\/h3>\n<p>If you control the sending server (Postfix, Exim, etc.), connect via SSH and examine log files, typically under <code>\/var\/log\/<\/code>. For each major mailbox provider, look for:<\/p>\n<ul>\n<li>Repeated 4xx deferrals mentioning \u201crate limiting\u201d or \u201ctemporary local problem\u201d<\/li>\n<li>5xx rejections mentioning \u201cspam\u201d, \u201cpolicy\u201d, \u201cblacklist\u201d or \u201ccontent rejected\u201d<\/li>\n<li>Authentication failures where SPF\/DKIM\/DMARC are explicitly cited<\/li>\n<\/ul>\n<p>Group issues by receiving domain. If one provider is significantly stricter than others, you may need provider\u2011specific tweaks, such as gentler ramp\u2011up or content changes for that audience.<\/p>\n<h3><span id=\"53_Track_acceptance_vs_delivery_vs_engagement\">5.3 Track acceptance vs delivery vs engagement<\/span><\/h3>\n<p>Many teams stop at \u201cthe SMTP server accepted the message, we\u2019re done\u201d. For a proper deliverability audit, you want visibility across three layers:<\/p>\n<ul>\n<li><strong>Acceptance:<\/strong> Did the remote MTA accept the message? (SMTP logs)<\/li>\n<li><strong>Delivery:<\/strong> Is the message in inbox, promotions, or spam? (seed tests, user feedback)<\/li>\n<li><strong>Engagement:<\/strong> Did the user open\/click, or ignore\/complain? (ESP or app metrics)<\/li>\n<\/ul>\n<p>Combine these layers in your audit report so you can see if problems are primarily technical (non\u2011acceptance), filtering (spam placement), or engagement\u2011driven.<\/p>\n<h3><span id=\"54_Automated_monitoring_and_alerts\">5.4 Automated monitoring and alerts<\/span><\/h3>\n<p>A one\u2011time audit is useful, but the real power comes when you wire insights into ongoing monitoring:<\/p>\n<ul>\n<li>Use log analysis tools on your VPS or dedicated server to spot spikes in 4xx\/5xx rates.<\/li>\n<li>Set alerts if a specific provider\u2019s rejection rate crosses a defined threshold.<\/li>\n<li>Regularly export or API\u2011pull your sending stats to look for trends over weeks\/months.<\/li>\n<\/ul>\n<p>If you already centralise server logs (e.g. Apache\/Nginx) as described in our guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/birden-fazla-sunucuda-log-yonetimi-elk-ve-loki-stack-ile-merkezi-hosting-loglama\/\">centralised logging for multiple servers with ELK or Loki<\/a>, extend that setup to include email logs as well.<\/p>\n<h2><span id=\"6_Turn_the_Audit_Into_a_Repeatable_Checklist\">6. Turn the Audit Into a Repeatable Checklist<\/span><\/h2>\n<p>Deliverability isn\u2019t a one\u2011time project. Filters change, user behaviour shifts, and your sending pattern evolves as your business grows. The final step is to convert all these audit findings into a sustainable routine.<\/p>\n<h3><span id=\"61_Define_frequencies_for_each_check\">6.1 Define frequencies for each check<\/span><\/h3>\n<p>A practical schedule many teams use looks like this:<\/p>\n<ul>\n<li><strong>Every send:<\/strong> Check that unsubscribe links work and that high\u2011risk segments are excluded.<\/li>\n<li><strong>Monthly:<\/strong> Review complaint rates, engagement metrics, and top error codes.<\/li>\n<li><strong>Quarterly:<\/strong> Run the full DNS and IP reputation review, including blocklist checks.<\/li>\n<li><strong>Before big campaigns:<\/strong> Run inbox tests with seed addresses and verify that critical DNS records haven\u2019t changed.<\/li>\n<\/ul>\n<h3><span id=\"62_Assign_clear_ownership\">6.2 Assign clear ownership<\/span><\/h3>\n<p>In small teams, email can fall between marketing, IT and development. For your audit to stick, decide who owns:<\/p>\n<ul>\n<li><strong>DNS and server settings:<\/strong> Usually hosting\/IT or the DevOps team<\/li>\n<li><strong>List hygiene and content:<\/strong> Usually marketing or CRM<\/li>\n<li><strong>Monitoring and reporting:<\/strong> Shared, but with one person responsible for summary dashboards<\/li>\n<\/ul>\n<p>Where we see deliverability fall apart most often at dchost.com is when no one feels responsible for the full chain end\u2011to\u2011end.<\/p>\n<h3><span id=\"63_Document_your_baseline_and_improvements\">6.3 Document your baseline and improvements<\/span><\/h3>\n<p>End your audit by documenting:<\/p>\n<ul>\n<li>Initial metrics (opens, bounces, complaints, spam placement)<\/li>\n<li>Problems discovered (e.g. missing DKIM for one subdomain, outdated SPF, blocklisted IP)<\/li>\n<li>Actions taken (DNS fixes, list cleanup, IP warmup, content changes)<\/li>\n<li>Results after 2\u20134 weeks and after 2\u20133 months<\/li>\n<\/ul>\n<p>This historical record is invaluable when you onboard new staff, change hosting, or migrate email systems. For a broader perspective on typical causes, our article on <a href=\"https:\/\/www.dchost.com\/blog\/en\/e-postalar-neden-spam-klasorune-dusuyor-paylasimli-hosting-ve-vps-icin-teslim-edilebilirlik-kontrol-listesi\/\">why emails go to spam on shared hosting and VPS<\/a> complements the checklist you\u2019ve just built.<\/p>\n<h2><span id=\"Bringing_It_All_Together_and_What_to_Do_Next\">Bringing It All Together (and What to Do Next)<\/span><\/h2>\n<p>A solid email deliverability audit is not about chasing a magic score in a single tool. It\u2019s about seeing the full picture: DNS records that unambiguously identify your senders, IPs and domains with clean reputations, content and list practices that users actually like, and log analysis that tells you in plain language when something goes wrong. If you approach it methodically, you don\u2019t need to be an email guru to get 80\u201390% of the benefits.<\/p>\n<p>From the hosting side, that means making sure your DNS zone, PTR records, and mail server on your dchost.com shared hosting, VPS, dedicated server or colocated hardware are configured exactly as your audit prescribes. From the application side, it means disciplined list management and honest, useful messages. If you\u2019re planning to change infrastructure soon, combine this audit with a review of your hosting resources; our guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/e-posta-hosting-secimi-kendi-sunucunuz-mu-paylasimli-hosting-mi-google-workspace-ve-microsoft-365-mi\/\">choosing the right email hosting architecture<\/a> can help you decide whether to keep email on your hosting account, move it to a dedicated VPS, or mix approaches. Whichever route you choose, treat this checklist as a living document you revisit a few times a year. That\u2019s how you keep important messages in the inbox, where they belong.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Email delivery problems rarely come from a single cause. In real audits we run for dchost.com customers, poor inbox placement is almost always a mix of DNS gaps, weak IP reputation, content that annoys filters, and quiet error signals hiding in SMTP logs. The good news: if you approach it as a structured audit instead [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4690,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-4689","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-teknoloji"],"_links":{"self":[{"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/posts\/4689","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/comments?post=4689"}],"version-history":[{"count":0,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/posts\/4689\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/media\/4690"}],"wp:attachment":[{"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/media?parent=4689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/categories?post=4689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/tags?post=4689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}