{"id":21846,"date":"2025-12-24T05:21:00","date_gmt":"2025-12-24T04:21:00","guid":{"rendered":"https:\/\/www.curiaweb.ch\/?p=21846"},"modified":"2026-08-25T05:34:08","modified_gmt":"2026-08-25T03:34:08","slug":"domain-and-email-relationship","status":"publish","type":"post","link":"https:\/\/www.curiaweb.ch\/en\/domain-und-email-zusammenhang\/","title":{"rendered":"Domain &amp; E-Mail: Why both are inextricably linked"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Email is one of the most important communication channels for many companies. Quotes, invoices, customer inquiries, and internal information are exchanged via email every day.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What is often overlooked in the process: <strong>Your own domain is a central component of the business email infrastructure.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether a message is delivered correctly, whether a foreign server trusts the sender, and whether third parties can impersonate the supposed sender of your domain depends, among other things, on the correct DNS and email configuration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide explains in clear terms how domains and email are related, what role MX, SPF, DKIM, and DMARC play, and what companies should consider when transferring domains or making changes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How are a domain and an email connected?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A business email address simply consists of two parts. At <em>name@beispiel.ch<\/em> is<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>name<\/strong> the individual mailbox<\/li>\n\n\n\n<li><strong>example.ch<\/strong> the domain used<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A domain is much more than just the visible part after the @ symbol. Among other things, its DNS settings determine which mail servers receive emails for that domain and which systems are authorized to send messages on its behalf.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, business email communication will not function reliably without a correctly configured domain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What does DNS have to do with email?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>Domain Name System (DNS)<\/strong> contains various entries that perform different tasks for websites and email services.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For e-mail, the following entries are particularly relevant:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MX:<\/strong> determines which mail servers receive messages for the domain<\/li>\n\n\n\n<li><strong>SPF<\/strong> defines which servers are allowed to send emails on behalf of the domain<\/li>\n\n\n\n<li><strong>DKIM:<\/strong> signs outgoing messages with a cryptographic signature<\/li>\n\n\n\n<li><strong>DMARC:<\/strong> sets rules for handling messages that fail authentication checks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These entries fulfill different tasks and should not be viewed as independent individual measures. Together, they help to better secure your own domain as an email sender.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is an MX record?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The MX record (<em>Mail Exchange Record<\/em>) determines which mail server should receive emails for a domain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If someone sends a message, for example, to <em>info@beispiel.ch<\/em>, the sending mail server queries the DNS to find out which server is responsible for emails to <em>example.ch<\/em> is responsible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the MX record is incorrectly configured, messages can end up on the wrong server or not be delivered at all.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SPF: Who is allowed to send emails for my domain?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SPF stands for <strong>Sender Policy Framework<\/strong>. A DNS record can be used to specify which mail servers or services are authorized to send emails for a domain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This becomes particularly important when, in addition to the standard mail server, other services are used, such as newsletter systems, CRM applications, or external platforms.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An incorrect SPF configuration can cause legitimate messages to receive a lower score or be rejected by recipients.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DKIM: Digital signature for emails<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DKIM stands for <strong>DomainKeys Identified Mail<\/strong>. Outgoing messages are cryptographically signed in the process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The receiving mail server can use a public key in the DNS to check whether the signature matches the domain and whether relevant parts of the message were altered after sending.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DKIM is thus an important component of modern email authentication.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DMARC: Rules against the misuse of your own domain<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DMARC stands for <strong>Domain-based Message Authentication, Reporting and Conformance<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DMARC builds upon SPF and DKIM and allows domain owners to specify how recipients should handle messages that fail certain authentication checks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the configuration, such messages can, for example, be monitored further, treated in quarantine, or rejected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DMARC can also provide reports that indicate which systems are sending emails on behalf of a domain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why do business emails end up in spam?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If emails end up in the spam folder, the cause is not necessarily the email program being used.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Possible causes include, for example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>missing or incorrect SPF records<\/li>\n\n\n\n<li>missing DKIM signature<\/li>\n\n\n\n<li>inappropriate DMARC configuration<\/li>\n\n\n\n<li>poor reputation of the sending IP address<\/li>\n\n\n\n<li>suspicious shipping behavior<\/li>\n\n\n\n<li>problematic message content<\/li>\n\n\n\n<li>faulty mail server configuration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A clean domain and DNS configuration is therefore an important foundation for good deliverability, but not the only factor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For more information on protection and deliverability, please visit <strong><a href=\"https:\/\/www.curiaweb.ch\/en\/spamexperts-spam-filter\/\" data-type=\"page\" data-id=\"18798\">Email Security &amp; Deliverability<\/a><\/strong> .<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What happens to the emails during a domain transfer?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A domain transfer initially simply means that the administration of a domain is transferred from one registrar to another.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Such a transfer does not automatically have to lead to an email outage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It becomes problematic if, during the transfer, nameservers or DNS zones are changed at the same time and important email records are not correctly migrated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These include in particular:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MX records<\/li>\n\n\n\n<li>SPF records<\/li>\n\n\n\n<li>DKIM records<\/li>\n\n\n\n<li>DMARC records<\/li>\n\n\n\n<li>further verification or service records<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, before a transfer, the existing DNS configuration should be fully documented and checked.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We explain in detail how to properly prepare for a provider switch in our guide. <a href=\"https:\/\/www.curiaweb.ch\/en\/domain-transfer-ohne-ausfall\/\"><strong>Domain Transfer Without Downtime: Checklist &amp; Common Mistakes<\/strong><\/a> .<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What happens when you switch email providers?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Even a change of email provider requires changes to the domain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Typically, the MX records are adjusted in the process. Depending on the provider, SPF, DKIM, and possibly other DNS records must also be changed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is important to ensure a coordinated transition. If you remove old entries before the new system is fully set up, you risk causing unnecessary disruptions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why domain owners and access credentials matter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For companies, not only the technical configuration is crucial. Administrative control over the domain must also be clearly regulated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This becomes problematic, for example, when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the domain is registered to a former employee<\/li>\n\n\n\n<li>only an external agency has access to the domain management<\/li>\n\n\n\n<li>Access credentials are not documented<\/li>\n\n\n\n<li>nobody is responsible for renewals or DNS changes<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Since the website and email depend on the domain, losing control of a domain can have far-reaching consequences.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can find the basics on registration, administration, and security in our <a href=\"https:\/\/www.curiaweb.ch\/en\/domains-schweiz-leitfaden\/\"><strong>Guide to Domains in Switzerland<\/strong><\/a> .<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What happens when the domain expires?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If a business domain expires and is deactivated, normally not only the website is affected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Email communication under this domain can also fail. This can be particularly critical for companies because customer inquiries, orders, or other business messages are no longer delivered correctly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We explain which deadlines and risks play a role in this at <a href=\"https:\/\/www.curiaweb.ch\/en\/domain-abgelaufen-risiken\/\"><strong>What happens when a domain expires?<\/strong><\/a> .<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why centralized management can have advantages<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Domain, website, and email do not necessarily have to be hosted with the same provider. Splitting them up can make complete technical sense.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, it does increase the number of systems and points of contact involved. In the event of a problem, it must first be determined whether the cause lies with the registrar, DNS, web hosting provider, or email provider.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A centralized or at least cleanly coordinated administration can therefore offer advantages, particularly for SMEs:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>clearer responsibilities<\/li>\n\n\n\n<li>simpler error analysis<\/li>\n\n\n\n<li>less coordination effort for changes<\/li>\n\n\n\n<li>faster support for outages<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">With CURIAWEB, domains, web hosting, and email services can be managed together. This reduces interfaces and creates a single point of contact.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Information on domain management can be found at <a href=\"https:\/\/www.curiaweb.ch\/en\/domains\/\"><strong>Domains at CURIAWEB<\/strong><\/a> .<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: Always consider domain and email together<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A domain is not just the address of a website. At the same time, it is an essential part of the business email infrastructure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MX defines where messages are received. SPF, DKIM, and DMARC help authenticate senders and make it harder to abuse your own domain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These connections should be taken into account, especially during domain transfers, DNS changes, or when switching email providers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By ensuring that your domain and email are properly configured together, you can reduce the risk of outages, improve the conditions for reliable delivery, and better protect your domain from misuse.<\/p>","protected":false},"excerpt":{"rendered":"<p>Domains and email are technically closely related. Learn what role MX, SPF, DKIM, and DMARC play and how to avoid delivery issues and outages.<\/p>","protected":false},"author":1,"featured_media":21850,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[77],"tags":[],"class_list":["post-21846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-domain"],"_links":{"self":[{"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/posts\/21846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/comments?post=21846"}],"version-history":[{"count":2,"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/posts\/21846\/revisions"}],"predecessor-version":[{"id":21851,"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/posts\/21846\/revisions\/21851"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/media\/21850"}],"wp:attachment":[{"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/media?parent=21846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/categories?post=21846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.curiaweb.ch\/en\/wp-json\/wp\/v2\/tags?post=21846"}],"curies":[{"name":"WP","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}