{"id":3728,"date":"2025-12-30T14:49:57","date_gmt":"2025-12-30T11:49:57","guid":{"rendered":"https:\/\/www.dchost.com\/blog\/what-are-mta-sts-tls-rpt-and-bimi-advanced-dns-settings-for-safer-email-and-stronger-brands\/"},"modified":"2025-12-30T14:49:57","modified_gmt":"2025-12-30T11:49:57","slug":"what-are-mta-sts-tls-rpt-and-bimi-advanced-dns-settings-for-safer-email-and-stronger-brands","status":"publish","type":"post","link":"https:\/\/www.dchost.com\/blog\/en\/what-are-mta-sts-tls-rpt-and-bimi-advanced-dns-settings-for-safer-email-and-stronger-brands\/","title":{"rendered":"What Are MTA\u2011STS, TLS\u2011RPT and BIMI? Advanced DNS Settings for Safer Email and Stronger Brands"},"content":{"rendered":"<div class=\"dchost-blog-content-wrapper\"><p>When teams ask why their perfectly legitimate emails still land in spam or why their logo does not show up in inboxes, the discussion quickly moves beyond basic SPF and DKIM. Today, serious email security and brand visibility depend on a second layer of DNS-based standards: <strong>MTA\u2011STS<\/strong>, <strong>TLS\u2011RPT<\/strong> and <strong>BIMI<\/strong>. These records do not replace SPF, DKIM and DMARC; they sit on top and tell other mail servers how strictly to enforce encryption, how to report problems, and how to display your visual brand when everything checks out.<\/p>\n<p>In this article, we will walk through what MTA\u2011STS, TLS\u2011RPT and BIMI actually do, how they fit into your existing email setup, and what kind of DNS and hosting environment you need to deploy them safely. At dchost.com, we see the same questions repeatedly during security audits and deliverability reviews for domains hosted on our shared hosting, <a href=\"https:\/\/www.dchost.com\/vps\">VPS<\/a>, <a href=\"https:\/\/www.dchost.com\/dedicated-server\">dedicated server<\/a>s and colocation platforms. The goal here is to give you a practical, production-oriented view so you can plan, implement and maintain these records without breaking email delivery.<\/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=\"#Where_MTASTS_TLSRPT_and_BIMI_Fit_in_the_Email_Security_Stack\"><span class=\"toc_number toc_depth_1\">1<\/span> Where MTA\u2011STS, TLS\u2011RPT and BIMI Fit in the Email Security Stack<\/a><\/li><li><a href=\"#MTASTS_Enforcing_TLS_Encryption_for_Your_Domain8217s_Email\"><span class=\"toc_number toc_depth_1\">2<\/span> MTA\u2011STS: Enforcing TLS Encryption for Your Domain&#8217;s Email<\/a><ul><li><a href=\"#How_MTASTS_Works_DNS_Record_Policy_File\"><span class=\"toc_number toc_depth_2\">2.1<\/span> How MTA\u2011STS Works: DNS Record + Policy File<\/a><\/li><li><a href=\"#MTASTS_Policy_Modes_none_testing_enforce\"><span class=\"toc_number toc_depth_2\">2.2<\/span> MTA\u2011STS Policy Modes: none, testing, enforce<\/a><\/li><li><a href=\"#Example_MTASTS_Policy_and_DNS_Record\"><span class=\"toc_number toc_depth_2\">2.3<\/span> Example: MTA\u2011STS Policy and DNS Record<\/a><\/li><li><a href=\"#Common_MTASTS_Pitfalls_We_See\"><span class=\"toc_number toc_depth_2\">2.4<\/span> Common MTA\u2011STS Pitfalls We See<\/a><\/li><\/ul><\/li><li><a href=\"#TLSRPT_Seeing_When_TLS_Fails_for_Your_Domain\"><span class=\"toc_number toc_depth_1\">3<\/span> TLS\u2011RPT: Seeing When TLS Fails for Your Domain<\/a><ul><li><a href=\"#How_TLSRPT_Works_in_Practice\"><span class=\"toc_number toc_depth_2\">3.1<\/span> How TLS\u2011RPT Works in Practice<\/a><\/li><li><a href=\"#Example_TLSRPT_DNS_Record\"><span class=\"toc_number toc_depth_2\">3.2<\/span> Example TLS\u2011RPT DNS Record<\/a><\/li><\/ul><\/li><li><a href=\"#BIMI_Turning_Email_Authentication_Into_Visual_Brand_Trust\"><span class=\"toc_number toc_depth_1\">4<\/span> BIMI: Turning Email Authentication Into Visual Brand Trust<\/a><ul><li><a href=\"#BIMI_Requirements_Before_You_Start\"><span class=\"toc_number toc_depth_2\">4.1<\/span> BIMI Requirements Before You Start<\/a><\/li><li><a href=\"#How_BIMI_Works_DNS_TXT_SVG_Logo\"><span class=\"toc_number toc_depth_2\">4.2<\/span> How BIMI Works: DNS TXT + SVG Logo<\/a><\/li><li><a href=\"#Example_BIMI_DNS_Record_and_Logo_Hosting\"><span class=\"toc_number toc_depth_2\">4.3<\/span> Example BIMI DNS Record and Logo Hosting<\/a><\/li><\/ul><\/li><li><a href=\"#The_DNS_Records_You_Need_Quick_Reference\"><span class=\"toc_number toc_depth_1\">5<\/span> The DNS Records You Need: Quick Reference<\/a><\/li><li><a href=\"#Shared_Hosting_vs_VPSDedicated_Where_to_Host_Policies_and_Logos\"><span class=\"toc_number toc_depth_1\">6<\/span> Shared Hosting vs VPS\/Dedicated: Where to Host Policies and Logos<\/a><ul><li><a href=\"#On_Shared_Hosting\"><span class=\"toc_number toc_depth_2\">6.1<\/span> On Shared Hosting<\/a><\/li><li><a href=\"#On_VPS_Dedicated_or_Colocation_Servers\"><span class=\"toc_number toc_depth_2\">6.2<\/span> On VPS, Dedicated or Colocation Servers<\/a><\/li><\/ul><\/li><li><a href=\"#Monitoring_Maintenance_and_Troubleshooting\"><span class=\"toc_number toc_depth_1\">7<\/span> Monitoring, Maintenance and Troubleshooting<\/a><ul><li><a href=\"#Using_TLSRPT_and_DMARC_Reports_Together\"><span class=\"toc_number toc_depth_2\">7.1<\/span> Using TLS\u2011RPT and DMARC Reports Together<\/a><\/li><li><a href=\"#Typical_Problems_and_How_We_Fix_Them\"><span class=\"toc_number toc_depth_2\">7.2<\/span> Typical Problems and How We Fix Them<\/a><\/li><\/ul><\/li><li><a href=\"#A_Practical_RollOut_Plan_for_MTASTS_TLSRPT_and_BIMI\"><span class=\"toc_number toc_depth_1\">8<\/span> A Practical Roll\u2011Out Plan for MTA\u2011STS, TLS\u2011RPT and BIMI<\/a><\/li><li><a href=\"#Conclusion_Turning_DNS_Into_a_Security_and_Brand_Asset\"><span class=\"toc_number toc_depth_1\">9<\/span> Conclusion: Turning DNS Into a Security and Brand Asset<\/a><\/li><\/ul><\/div>\n<h2><span id=\"Where_MTASTS_TLSRPT_and_BIMI_Fit_in_the_Email_Security_Stack\">Where MTA\u2011STS, TLS\u2011RPT and BIMI Fit in the Email Security Stack<\/span><\/h2>\n<p>Before going deeper, it helps to put these three standards in context. Most organizations already know the first layer:<\/p>\n<ul>\n<li><strong>SPF<\/strong>: tells the world which servers are allowed to send email for your domain.<\/li>\n<li><strong>DKIM<\/strong>: cryptographically signs your emails so recipients can verify they were not altered.<\/li>\n<li><strong>DMARC<\/strong>: says what to do when SPF\/DKIM fail (monitor, quarantine, reject) and where to send reports.<\/li>\n<li><strong>rDNS \/ PTR<\/strong>: links your sending IP back to a domain, which most providers now expect.<\/li>\n<\/ul>\n<p>If you need a refresher, we have a detailed guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/spf-dkim-ve-dmarc-nedir-ozel-alan-adi-ile-e-posta-dogrulamasini-cpanel-ve-vpste-sifirdan-kurmak\/\">how to set up SPF, DKIM and DMARC correctly on cPanel or a VPS<\/a>, and another step\u2011by\u2011step article about <a href=\"https:\/\/www.dchost.com\/blog\/en\/spf-dkim-dmarc-ve-rdns-ile-e-posta-teslim-edilebilirligini-nasil-adim-adim-yukseltirsin\/\">improving email deliverability with SPF, DKIM, DMARC and rDNS<\/a>.<\/p>\n<p>Once that foundation is solid, you can add the second layer:<\/p>\n<ul>\n<li><strong>MTA\u2011STS<\/strong>: ensures that <em>SMTP connections to your domain are encrypted with TLS<\/em>, and that they go to the right MX servers.<\/li>\n<li><strong>TLS\u2011RPT<\/strong>: gives you <em>aggregated reports<\/em> when other providers cannot establish secure TLS connections to your mail servers.<\/li>\n<li><strong>BIMI<\/strong>: lets inboxes display your <em>verified brand logo<\/em> next to messages that pass DMARC alignment and reputation checks.<\/li>\n<\/ul>\n<p>Think of SPF\/DKIM\/DMARC as identity and policy, and MTA\u2011STS\/TLS\u2011RPT\/BIMI as encryption assurance and visual trust. Together, they reduce phishing risk, increase transport security, and help your real messages stand out in crowded inboxes.<\/p>\n<h2><span id=\"MTASTS_Enforcing_TLS_Encryption_for_Your_Domain8217s_Email\">MTA\u2011STS: Enforcing TLS Encryption for Your Domain&#8217;s Email<\/span><\/h2>\n<p><strong>MTA\u2011STS (Mail Transfer Agent Strict Transport Security)<\/strong> is to SMTP what HSTS is to HTTPS. It lets you publish a policy saying: \u201cOther mail servers must talk to my MX servers over TLS using valid certificates; if they cannot, they should fail instead of falling back to plaintext.\u201d This protects you from downgrade attacks and some man\u2011in\u2011the\u2011middle scenarios on the email transport layer.<\/p>\n<h3><span id=\"How_MTASTS_Works_DNS_Record_Policy_File\">How MTA\u2011STS Works: DNS Record + Policy File<\/span><\/h3>\n<p>MTA\u2011STS has two key components, both of which you need to host correctly:<\/p>\n<ol>\n<li><strong>DNS TXT record<\/strong> at <code>_mta-sts.example.com<\/code> that announces the existence and version of your policy.<\/li>\n<li><strong>HTTPS policy file<\/strong> at <code>https:\/\/mta-sts.example.com\/.well-known\/mta-sts.txt<\/code> describing your MX hosts, policy mode and max age.<\/li>\n<\/ol>\n<p>When another provider (say, a large mailbox provider) wants to send mail to <code>user@example.com<\/code>, it:<\/p>\n<ul>\n<li>Looks up the <code>_mta-sts.example.com<\/code> TXT record to see if MTA\u2011STS is enabled and which version of the policy to use.<\/li>\n<li>Fetches the policy file via HTTPS from <code>mta-sts.example.com<\/code>.<\/li>\n<li>Checks if the MX records it will use match the hosts listed in the policy.<\/li>\n<li>Attempts an SMTP connection with TLS that validates against a trusted certificate for those MX hosts.<\/li>\n<li>Follows your policy mode to decide whether to deliver, fail, or only report problems.<\/li>\n<\/ul>\n<h3><span id=\"MTASTS_Policy_Modes_none_testing_enforce\">MTA\u2011STS Policy Modes: none, testing, enforce<\/span><\/h3>\n<p>Your MTA\u2011STS policy file has a <code>mode<\/code> directive:<\/p>\n<ul>\n<li><strong>mode=none<\/strong>: policy is published but not enforced; it is mainly for discovery and future use.<\/li>\n<li><strong>mode=testing<\/strong>: providers can send TLS reports when something is wrong, but still deliver mail even if TLS fails.<\/li>\n<li><strong>mode=enforce<\/strong>: providers must <em>refuse to deliver<\/em> mail if they cannot establish a secure TLS connection that matches your policy.<\/li>\n<\/ul>\n<p>In real migrations we run at dchost.com, we almost always start with <strong>testing<\/strong> for a few weeks, monitor TLS\u2011RPT reports, fix misconfigurations, then move to <strong>enforce<\/strong> once we are confident.<\/p>\n<h3><span id=\"Example_MTASTS_Policy_and_DNS_Record\">Example: MTA\u2011STS Policy and DNS Record<\/span><\/h3>\n<p>Here is a simple policy file for a domain whose MX records point to <code>mail1.example.com<\/code> and <code>mail2.example.com<\/code>:<\/p>\n<pre class=\"language-bash line-numbers\"><code class=\"language-bash\">version: STSv1\nmode: testing\nmx: mail1.example.com\nmx: mail2.example.com\nmax_age: 604800\n<\/code><\/pre>\n<p>The corresponding DNS TXT record at <code>_mta-sts.example.com<\/code> could look like this:<\/p>\n<pre class=\"language-bash line-numbers\"><code class=\"language-bash\">_mta-sts.example.com. 3600 IN TXT 'v=STSv1; id=20250101T000000;'\n<\/code><\/pre>\n<p>The <code>id<\/code> value is just a policy version string. When you change your policy file (for example, when adding a new MX host), you should also change this <code>id<\/code> so senders know they must refetch the policy.<\/p>\n<h3><span id=\"Common_MTASTS_Pitfalls_We_See\">Common MTA\u2011STS Pitfalls We See<\/span><\/h3>\n<p>When we audit domains hosted on our shared hosting, VPS or dedicated servers, the same MTA\u2011STS issues keep appearing:<\/p>\n<ul>\n<li><strong>MX hosts in policy do not match real MX records<\/strong>: For example, the policy lists mail.example.com but DNS MX points to mail.eu.example.com. This causes enforcement failures.<\/li>\n<li><strong>Missing or invalid TLS certificates<\/strong>: Your MX hosts must present certificates whose CN\/SAN matches the hostnames in the policy, and they must be trusted (for example, issued by a recognized CA and not expired).<\/li>\n<li><strong>Forgetting the HTTPS endpoint<\/strong>: Publishing the TXT record without hosting a valid <code>mta-sts.txt<\/code> file over HTTPS breaks the standard.<\/li>\n<li><strong>Jumping straight to enforce<\/strong>: Putting <code>mode=enforce<\/code> in place before checking TLS\u2011RPT reports can cause legitimate mail to be rejected if any path is misconfigured.<\/li>\n<\/ul>\n<p>If you are already familiar with DANE\/TLSA for SMTP, you can combine both approaches. We have a separate article focused on a <a href=\"https:\/\/www.dchost.com\/blog\/en\/mta-sts-tls-rpt-ve-dane-tlsa-ile-smtp-guvenligi-teslim-edilebilirligi-ve-sifrelemeyi-nasil-guclendirirsin\/\">deeper dive into MTA\u2011STS, TLS\u2011RPT and DANE\/TLSA for SMTP security<\/a>, where we compare DNSSEC-based and policy-file-based methods.<\/p>\n<h2><span id=\"TLSRPT_Seeing_When_TLS_Fails_for_Your_Domain\">TLS\u2011RPT: Seeing When TLS Fails for Your Domain<\/span><\/h2>\n<p><strong>TLS\u2011RPT (SMTP TLS Reporting)<\/strong> is the visibility layer for MTA\u2011STS and opportunistic TLS. It lets other providers send you daily aggregate reports about TLS negotiation problems they encounter when trying to deliver mail to your domain.<\/p>\n<p>Common problems surfaced by TLS\u2011RPT include:<\/p>\n<ul>\n<li>Expired or misconfigured certificates on your MX hosts.<\/li>\n<li>Unsupported protocol versions or cipher suites.<\/li>\n<li>DNS issues that prevent connecting to the advertised MX servers.<\/li>\n<li>Policy mismatches between MTA\u2011STS and real-world SMTP connections.<\/li>\n<\/ul>\n<h3><span id=\"How_TLSRPT_Works_in_Practice\">How TLS\u2011RPT Works in Practice<\/span><\/h3>\n<p>To enable TLS\u2011RPT, you publish a single DNS record at <code>_smtp._tls.example.com<\/code>. This record tells senders where to email their aggregate reports, usually in JSON format, compressed and attached. A typical flow:<\/p>\n<ol>\n<li>Sender attempts to deliver mail to your domain over TLS.<\/li>\n<li>If there is a TLS issue, it records the outcome (failure type, affected MX, counts).<\/li>\n<li>Once per day, it bundles all incidents into a report and sends it to the email address from your TLS\u2011RPT record.<\/li>\n<li>You (or your monitoring system) process these reports to detect trends and problems.<\/li>\n<\/ol>\n<p>We usually recommend sending these reports to a dedicated mailbox like <code>tlsrpt@example.com<\/code> or to a processing service capable of aggregating and visualizing them. The volume is similar to DMARC RUA reports, and they are not meant to be read manually every day.<\/p>\n<h3><span id=\"Example_TLSRPT_DNS_Record\">Example TLS\u2011RPT DNS Record<\/span><\/h3>\n<p>Here is a minimal TLS\u2011RPT record:<\/p>\n<pre class=\"language-bash line-numbers\"><code class=\"language-bash\">_smtp._tls.example.com. 3600 IN TXT 'v=TLSRPTv1; rua=mailto:tlsrpt@example.com;'\n<\/code><\/pre>\n<p>You can list multiple addresses separated by commas:<\/p>\n<pre class=\"language-bash line-numbers\"><code class=\"language-bash\">_smtp._tls.example.com. 3600 IN TXT 'v=TLSRPTv1; rua=mailto:tlsrpt@example.com,mailto:secops@example.net;'\n<\/code><\/pre>\n<p>After publishing the record, give providers some time to pick it up. In our experience, large email providers typically start sending reports within 24\u201348 hours once they see you also have MTA\u2011STS or a significant volume of TLS traffic.<\/p>\n<h2><span id=\"BIMI_Turning_Email_Authentication_Into_Visual_Brand_Trust\">BIMI: Turning Email Authentication Into Visual Brand Trust<\/span><\/h2>\n<p><strong>BIMI (Brand Indicators for Message Identification)<\/strong> uses DNS to tell participating mailbox providers which logo to display next to email from your domain. When combined with strong DMARC settings and good reputation, it turns your security investments into a visible trust signal for users.<\/p>\n<p>However, BIMI is <em>very strict<\/em> about prerequisites. Many domains add a BIMI record and then wonder why nothing shows up. The answer is almost always: DMARC and reputation requirements are not fully met.<\/p>\n<h3><span id=\"BIMI_Requirements_Before_You_Start\">BIMI Requirements Before You Start<\/span><\/h3>\n<p>Before touching BIMI DNS, you should ensure that:<\/p>\n<ul>\n<li><strong>DMARC is in enforcement<\/strong> with <code>p=quarantine<\/code> or <code>p=reject<\/code>, not just <code>p=none<\/code>.<\/li>\n<li><strong>Alignment is correct<\/strong>: the domains used in From:, SPF and DKIM are aligned according to DMARC rules.<\/li>\n<li><strong>SPF and DKIM pass consistently<\/strong> for the majority of your email streams.<\/li>\n<li><strong>Your sending reputation is clean<\/strong>: you are not on major blocklists, and your spam complaint rates are low.<\/li>\n<li>Depending on the provider, you may need a <strong>Verified Mark Certificate (VMC)<\/strong> for your logo, especially for some large mailbox providers.<\/li>\n<\/ul>\n<p>If you want to go deeper into DMARC analytics, forensic reports and BIMI tuning, we already covered <a href=\"https:\/\/www.dchost.com\/blog\/en\/gelismis-dmarc-ve-bimi-rua-ruf-raporlarindan-marka-gostergesine-nasil-yol-alinir\/\">advanced DMARC reporting and BIMI implementation in more depth<\/a>. Here we will focus on how BIMI interacts with DNS and your hosting.<\/p>\n<h3><span id=\"How_BIMI_Works_DNS_TXT_SVG_Logo\">How BIMI Works: DNS TXT + SVG Logo<\/span><\/h3>\n<p>BIMI relies on a TXT record at <code>default._bimi.example.com<\/code>. This record points to an SVG logo file, and optionally publishes VMC details. The logo itself must be served over HTTPS from a stable, high\u2011availability location.<\/p>\n<p>The flow looks like this:<\/p>\n<ol>\n<li>Mailbox provider receives a message from <code>user@example.com<\/code>.<\/li>\n<li>It validates SPF, DKIM and DMARC alignment; if they pass and DMARC is enforced, it may look for a BIMI record.<\/li>\n<li>It queries <code>default._bimi.example.com<\/code> for a BIMI TXT record.<\/li>\n<li>If the record is valid and your reputation is good, it fetches the SVG logo from the <code>l=<\/code> URL, validates VMC if used, and caches the logo.<\/li>\n<li>It may display the logo next to your messages in the UI.<\/li>\n<\/ol>\n<h3><span id=\"Example_BIMI_DNS_Record_and_Logo_Hosting\">Example BIMI DNS Record and Logo Hosting<\/span><\/h3>\n<p>A basic BIMI record without VMC might look like this:<\/p>\n<pre class=\"language-bash line-numbers\"><code class=\"language-bash\">default._bimi.example.com. 3600 IN TXT 'v=BIMI1; l=https:\/\/assets.example.com\/bimi\/logo.svg;'\n<\/code><\/pre>\n<p>If you are using a Verified Mark Certificate, you would add a <code>a=<\/code> tag pointing to the certificate:<\/p>\n<pre class=\"language-bash line-numbers\"><code class=\"language-bash\">default._bimi.example.com. 3600 IN TXT 'v=BIMI1; l=https:\/\/assets.example.com\/bimi\/logo.svg; a=https:\/\/assets.example.com\/bimi\/vmc.pem;'\n<\/code><\/pre>\n<p>Key hosting considerations for the logo:<\/p>\n<ul>\n<li><strong>Use HTTPS<\/strong> with a valid TLS certificate; HTTP will not work.<\/li>\n<li><strong>Serve from a reliable origin<\/strong>: a subdomain on your main site, a static asset server, or a CDN fronting one of your servers at dchost.com.<\/li>\n<li><strong>Correct format<\/strong>: BIMI logos must be specific \u201cSVG Tiny Portable\/Secure\u201d style files, not arbitrary SVGs. Many providers have validators.<\/li>\n<\/ul>\n<p>Because BIMI queries are not as frequent as normal web traffic, hosting the SVG on the same VPS or dedicated server where you host your main site is usually fine, as long as you apply standard security hardening. If you are already using a CDN, you can place the BIMI logo on the same static asset domain.\n<\/p>\n<h2><span id=\"The_DNS_Records_You_Need_Quick_Reference\">The DNS Records You Need: Quick Reference<\/span><\/h2>\n<p>Let\u2019s summarize the core DNS records involved in MTA\u2011STS, TLS\u2011RPT and BIMI:<\/p>\n<ul>\n<li><strong>MTA\u2011STS TXT record<\/strong>\n<ul>\n<li>Host: <code>_mta-sts.example.com<\/code><\/li>\n<li>Value example: <code>v=STSv1; id=20250101T000000;<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>MTA\u2011STS policy host A\/AAAA or CNAME<\/strong>\n<ul>\n<li>Host: <code>mta-sts.example.com<\/code><\/li>\n<li>Points to the web server that serves <code>\/.well-known\/mta-sts.txt<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>TLS\u2011RPT TXT record<\/strong>\n<ul>\n<li>Host: <code>_smtp._tls.example.com<\/code><\/li>\n<li>Value example: <code>v=TLSRPTv1; rua=mailto:tlsrpt@example.com;<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>BIMI TXT record<\/strong>\n<ul>\n<li>Host: <code>default._bimi.example.com<\/code><\/li>\n<li>Value example: <code>v=BIMI1; l=https:\/\/assets.example.com\/bimi\/logo.svg;<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>Supporting records<\/strong> (already needed but must be correct)\n<ul>\n<li>MX records pointing to your mail servers.<\/li>\n<li>A\/AAAA records for your MX hosts, with proper rDNS\/PTR for sending IPs.<\/li>\n<li>SPF, DKIM and DMARC records in healthy, enforced configuration.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>If you are also sending email over IPv6, we strongly recommend checking your AAAA, PTR and SPF records for consistency. Our guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/ipv6-ile-e%e2%80%91posta-teslimi-nasil-rayina-oturur-ptr-helo-spf-ve-rbllerle-saha-rehberi\/\">how to deliver email reliably over IPv6<\/a> goes through PTR, HELO and blocklist issues that can silently hurt deliverability.<\/p>\n<h2><span id=\"Shared_Hosting_vs_VPSDedicated_Where_to_Host_Policies_and_Logos\">Shared Hosting vs VPS\/Dedicated: Where to Host Policies and Logos<\/span><\/h2>\n<p>At dchost.com we see two common architectures: domains whose email is hosted on our shared hosting platform, and domains with custom mail stacks on VPS, dedicated servers or colocation. Both can support MTA\u2011STS, TLS\u2011RPT and BIMI, but the operational details differ slightly.<\/p>\n<h3><span id=\"On_Shared_Hosting\">On Shared Hosting<\/span><\/h3>\n<p>On a typical shared hosting plan:<\/p>\n<ul>\n<li>Your MX records usually point to the provider\u2019s cluster (for example, <code>mail.yourdomain.com<\/code> CNAME to a shared mail host).<\/li>\n<li>SPF and DKIM are often auto-managed by the control panel.<\/li>\n<li>You still fully control DNS for <code>_mta-sts<\/code>, <code>_smtp._tls<\/code> and <code>_bimi<\/code> subdomains.<\/li>\n<\/ul>\n<p>To implement MTA\u2011STS and BIMI on shared hosting with dchost.com:<\/p>\n<ul>\n<li>Create a <code>mta-sts.yourdomain.com<\/code> subdomain in the panel and point it to your hosting account.<\/li>\n<li>Upload your <code>\/.well-known\/mta-sts.txt<\/code> policy file to the correct directory.<\/li>\n<li>Host your BIMI logo (SVG) under a stable URL like <code>https:\/\/assets.yourdomain.com\/bimi\/logo.svg<\/code>.<\/li>\n<li>Publish TLS\u2011RPT, MTA\u2011STS and BIMI TXT records via the DNS editor.<\/li>\n<\/ul>\n<p>For most small businesses, this is enough. The key is to keep your panel-managed MX, SPF and DKIM in sync with any changes dchost.com support applies to the mail infrastructure.<\/p>\n<h3><span id=\"On_VPS_Dedicated_or_Colocation_Servers\">On VPS, Dedicated or Colocation Servers<\/span><\/h3>\n<p>If you run your own mail server stack (Postfix, Exim or similar) on a VPS, dedicated server or colocated hardware at dchost.com, you have more responsibility but also more flexibility:<\/p>\n<ul>\n<li>You define the MX hostnames and their IP addresses.<\/li>\n<li>You manage TLS certificates for SMTP, often using Let\u2019s Encrypt.<\/li>\n<li>You control how aggressively you adopt MTA\u2011STS enforcement.<\/li>\n<\/ul>\n<p>Best practices we recommend to customers in this scenario:<\/p>\n<ul>\n<li>Use a <strong>dedicated FQDN for MX<\/strong> such as <code>mx1.example.com<\/code>, <code>mx2.example.com<\/code>, and ensure both DNS and certificates match those names.<\/li>\n<li>Automate certificate renewal (for example, via ACME) and monitor expiry so that MTA\u2011STS enforcement never breaks due to an expired TLS certificate.<\/li>\n<li>Keep <strong>policy changes in lockstep<\/strong> with MX changes: when adding a new MX host, update your MTA\u2011STS policy file and <code>id<\/code> field at the same time.<\/li>\n<li>Monitor TLS\u2011RPT reports and SMTP logs, ideally integrated with your central logging stack. If you already use Prometheus and Grafana on your VPS, it is straightforward to add alerts around TLS failure spikes.<\/li>\n<\/ul>\n<p>For customers building more complex setups (multiple MX, backup MX, or split delivery between on\u2011prem and cloud), it can be useful to revisit your underlying architecture first. Our guide on <a href=\"https:\/\/www.dchost.com\/blog\/en\/e-posta-altyapisinda-yedeklilik-birden-fazla-mx-kaydi-backup-mx-ve-split-delivery-kurulumu\/\">email redundancy architecture with multiple MX, backup MX and split delivery<\/a> covers how redundant MX strategies interact with DNS and what to watch out for.<\/p>\n<h2><span id=\"Monitoring_Maintenance_and_Troubleshooting\">Monitoring, Maintenance and Troubleshooting<\/span><\/h2>\n<p>Publishing these records is not a fire\u2011and\u2011forget operation. They are more like security policies in code: you need to review, adjust and monitor them over time.<\/p>\n<h3><span id=\"Using_TLSRPT_and_DMARC_Reports_Together\">Using TLS\u2011RPT and DMARC Reports Together<\/span><\/h3>\n<p>In a healthy environment, you should:<\/p>\n<ul>\n<li>Review <strong>DMARC aggregate (RUA) reports<\/strong> to see who is sending mail on behalf of your domain, whether SPF\/DKIM pass, and whether alignment holds.<\/li>\n<li>Review <strong>TLS\u2011RPT reports<\/strong> to see where TLS negotiations are failing, which MX hosts or IPs are problematic, and whether certain providers have trouble connecting securely.<\/li>\n<\/ul>\n<p>Correlating the two can highlight issues such as:<\/p>\n<ul>\n<li>New third\u2011party senders that have not been added to your SPF or DKIM configuration yet.<\/li>\n<li>Misconfigured or legacy MX entries still receiving traffic without proper TLS.<\/li>\n<li>Regional connectivity problems affecting specific providers or IP ranges.<\/li>\n<\/ul>\n<p>In our experience, the first two to four weeks after enabling MTA\u2011STS and TLS\u2011RPT are the most informative. After that, you mainly watch for regressions: certificate renewals gone wrong, new MX records missing from policies, or changes in your DNS provider.<\/p>\n<h3><span id=\"Typical_Problems_and_How_We_Fix_Them\">Typical Problems and How We Fix Them<\/span><\/h3>\n<p>Here are some of the issues we routinely diagnose for customers and how we approach them:<\/p>\n<ul>\n<li><strong>Symptom:<\/strong> TLS\u2011RPT shows high counts of <em>certificate mismatch<\/em> errors.\n<ul>\n<li><strong>Cause:<\/strong> The MX host in DNS is <code>mail.example.com<\/code> but the SMTP certificate is issued for <code>mx.example.com<\/code>.<\/li>\n<li><strong>Fix:<\/strong> Either update DNS MX to point to <code>mx.example.com<\/code> or issue a new certificate covering <code>mail.example.com<\/code>. Then update MTA\u2011STS policy accordingly.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Symptom:<\/strong> DMARC reports show a large source failing SPF and DKIM; BIMI logo does not show.\n<ul>\n<li><strong>Cause:<\/strong> A new CRM or marketing platform added without updated SPF\/DKIM configuration.<\/li>\n<li><strong>Fix:<\/strong> Add the provider to your SPF record and configure DKIM on that platform, then revisit DMARC alignment. Only after DMARC is clean and <code>p=quarantine\/reject<\/code> is safe does BIMI make sense.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Symptom:<\/strong> Some providers intermittently fail to deliver with MTA\u2011STS in enforce mode.\n<ul>\n<li><strong>Cause:<\/strong> Intermittent TLS handshake issues, outdated cipher suites, or load balancer misconfigurations on one of several MX hosts.<\/li>\n<li><strong>Fix:<\/strong> Use targeted SMTP tests and logs to find the faulty MX, fix TLS and handshake settings there, then confirm via TLS\u2011RPT that failures drop.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>All of this is much easier if your underlying hosting is well tuned: current TLS versions, proper OCSP stapling, and modern cipher suites. If you want to revisit your TLS settings on the web side at the same time, our guides on <a href=\"https:\/\/www.dchost.com\/blog\/en\/ssl-tls-protokol-guncellemeleri-ve-guvenlik-aciklari\/\">TLS protocol updates and vulnerabilities<\/a> and <a href=\"https:\/\/www.dchost.com\/blog\/en\/tls-1-3-ve-modern-sifrelerin-sicacik-mutfagi-nginx-apachede-ocsp-stapling-hsts-preload-ve-pfs-nasil-kurulur\/\">enabling TLS 1.3, OCSP stapling and modern ciphers on Nginx\/Apache<\/a> are a good companion.<\/p>\n<h2><span id=\"A_Practical_RollOut_Plan_for_MTASTS_TLSRPT_and_BIMI\">A Practical Roll\u2011Out Plan for MTA\u2011STS, TLS\u2011RPT and BIMI<\/span><\/h2>\n<p>To avoid surprises, we usually suggest customers follow a staged approach:<\/p>\n<ol>\n<li><strong>Stabilize SPF, DKIM and DMARC<\/strong>\n<ul>\n<li>Make sure all legitimate senders are covered in SPF and DKIM.<\/li>\n<li>Move DMARC from <code>p=none<\/code> to <code>p=quarantine<\/code> and eventually <code>p=reject<\/code>, using reports to clean up.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Prepare your infrastructure<\/strong>\n<ul>\n<li>Verify your MX records, hostnames and TLS certificates.<\/li>\n<li>Decide where you will host <code>mta-sts.txt<\/code> and BIMI SVG\/VMC files (shared hosting, VPS, static asset domain, etc.).<\/li>\n<\/ul>\n<\/li>\n<li><strong>Enable TLS\u2011RPT first<\/strong>\n<ul>\n<li>Publish <code>_smtp._tls<\/code> TXT record with a dedicated reporting mailbox.<\/li>\n<li>Wait a few days to see initial reports and ensure parsing\/monitoring works.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Publish MTA\u2011STS in testing mode<\/strong>\n<ul>\n<li>Host <code>mta-sts.txt<\/code> with <code>mode=testing<\/code>, list all active MX hosts, and set a reasonable <code>max_age<\/code> (for example, 7 days).<\/li>\n<li>Create the <code>_mta-sts<\/code> TXT record with an initial <code>id<\/code> value.<\/li>\n<li>Monitor TLS\u2011RPT for at least two to four weeks, fixing any TLS or MX inconsistencies.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Move MTA\u2011STS to enforce<\/strong>\n<ul>\n<li>Once reports show a stable state and no systematic failures, change policy to <code>mode=enforce<\/code>.<\/li>\n<li>Update the <code>id<\/code> in your <code>_mta-sts<\/code> TXT record to signal the change.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Introduce BIMI<\/strong>\n<ul>\n<li>Ensure DMARC is enforced (not <code>p=none<\/code>) and that your spam\/complaint metrics are healthy.<\/li>\n<li>Prepare a compliant BIMI SVG logo and, if needed, a VMC.<\/li>\n<li>Host the logo (and VMC) on a stable HTTPS endpoint and publish the BIMI TXT record.<\/li>\n<li>Give mailbox providers time to validate, cache and start showing the logo; this is not instant.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>This staged approach avoids the common trap of deploying everything at once and then having to debug overlapping issues. It also fits well into a broader security and reliability program, where you are already handling TLS, DNS, backups and monitoring systematically. If you are in the process of modernizing your infrastructure anyway, our articles on <a href=\"https:\/\/www.dchost.com\/blog\/en\/vps-sunucu-guvenligi-pratik-olceklenebilir-ve-dogrulanabilir-yaklasimlar\/\">practical VPS security hardening<\/a> and <a href=\"https:\/\/www.dchost.com\/blog\/en\/3-2-1-yedekleme-stratejisi-neden-ise-yariyor-cpanel-plesk-ve-vpste-otomatik-yedekleri-nasil-kurarsin\/\">3\u20112\u20111 backup strategies<\/a> complement the email-side work.<\/p>\n<h2><span id=\"Conclusion_Turning_DNS_Into_a_Security_and_Brand_Asset\">Conclusion: Turning DNS Into a Security and Brand Asset<\/span><\/h2>\n<p>MTA\u2011STS, TLS\u2011RPT and BIMI may look like \u201cjust a few more DNS records\u201d, but in practice they mark a mindset change. Instead of treating DNS and TLS as static background settings, you start using them as active policy tools: forcing secure email transport, collecting machine\u2011readable visibility on failures, and rewarding strong authentication with visible brand presence in inboxes.<\/p>\n<p>On the infrastructure side, you need three things for this to work smoothly: stable DNS, reliable HTTPS hosting for policy and logo files, and mail servers with correctly managed TLS certificates. That is where choosing the right environment at dchost.com matters\u2014whether you run email on our shared hosting, operate your own SMTP stack on a VPS or dedicated server, or colocate your hardware in our data centers. We can help you design DNS, TLS and backup strategies that support these standards instead of fighting them.<\/p>\n<p>If you are not sure where to start, a good first step is to audit your current SPF, DKIM, DMARC and MX configuration, then plan a staged rollout of TLS\u2011RPT, MTA\u2011STS and finally BIMI. From there, you can refine monitoring and reporting, and gradually make your email infrastructure both safer and more recognizable in your customers\u2019 inboxes. When you are ready to align your domain, DNS, hosting and email under a single, consistent strategy, our team at dchost.com is here to help you design and run that stack end\u2011to\u2011end.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>When teams ask why their perfectly legitimate emails still land in spam or why their logo does not show up in inboxes, the discussion quickly moves beyond basic SPF and DKIM. Today, serious email security and brand visibility depend on a second layer of DNS-based standards: MTA\u2011STS, TLS\u2011RPT and BIMI. These records do not replace [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3729,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-3728","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\/3728","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=3728"}],"version-history":[{"count":0,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/posts\/3728\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/media\/3729"}],"wp:attachment":[{"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/media?parent=3728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/categories?post=3728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dchost.com\/blog\/en\/wp-json\/wp\/v2\/tags?post=3728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}