{"id":12994,"date":"2026-03-10T00:00:00","date_gmt":"2026-03-10T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/die-grundlagen-von-e-mail-subdomains\/"},"modified":"2026-09-15T18:17:36","modified_gmt":"2026-09-15T18:17:36","slug":"die-grundlagen-von-e-mail-subdomains","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/de\/blog\/email\/die-grundlagen-von-e-mail-subdomains\/","title":{"rendered":"Die Grundlagen von E-Mail-Subdomains"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">When it comes to email sending, sometimes you need more than the press of a button to get your message across. You may have heard of email subdomains, but you may be wondering what role they play in email outreach. How do you use them? Do they have anything to do with email deliverability? And, wait a minute, what exactly <i>are <\/i>they?<\/p>\n\n<p class=\"wp-block-paragraph\">Well, have no fear, because we\u2019re going to use this post to tell you all about email subdomains and why you need them. It\u2019s everything you ever wanted to know about subdomains but were afraid to ask. Now, let\u2019s get started.<\/p>\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-5340\"><p class=\"h5 m-0\" id=\"toc-title-5340\">Inhaltsverzeichnis<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-is-a-subdomain\">What is a subdomain?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#whats-the-difference-between-an-email-domain-and-an-email-subdomain\">What\u2019s the difference between an email domain and an email subdomain?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#why-should-you-use-an-email-subdomain\">Why should you use an email subdomain?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">04<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-subdomains-improve-your-deliverability\">How subdomains improve your deliverability<\/a><a class=\"scrollme link-body-color\" href=\"#best-practices-multiple-subdomains-in-action\">Best practices: Multiple subdomains in action<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">05<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-to-use-an-email-subdomain-in-mailgun\">How to use an email subdomain in Mailgun<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">06<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#wrapping-up\">Wrapping up<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What is a subdomain?<\/h2>\n\n<p class=\"wp-block-paragraph\">To understand what a subdomain is, you first need to know what domains are.<\/p>\n\n<p class=\"wp-block-paragraph\"><b>A domain is a unique, human-readable way of identifying a website.<\/b> Often, this is referred to as the parent domain or the root domain. Right now, you\u2019re on the domain <b>Mailgun.com<\/b>. Behind the scenes, the domain name is connected to a unique IP address through DNS records, but memorizing a set of four numbers is a lot harder than remembering the name Mailgun.com. Because of that, the human-readable way is used for identification purposes. You\u2019re going to need that.<\/p>\n\n<p class=\"wp-block-paragraph\">A subdomain is a prefix that comes before the root domain. <b>Subdomains are often used on websites to send traffic to a different IP address while still keeping users on the same root domain.<\/b> For example, Mailgun hosts our developer documentation on a separate service, so we use a <b>documentation<\/b> subdomain, <a href=\"https:\/\/documentation.mailgun.com\/en\/latest\/\" target=\"_tabs\" rel=\"noopener noreferrer\"><b>documentation.mailgun.com<\/b><\/a>.<\/p>\n\n<p class=\"wp-block-paragraph\">That\u2019s great, but how does this relate to email?<\/p>\n\n<h2 class=\"wp-block-heading\">What\u2019s the difference between an email domain and an email subdomain?<\/h2>\n\n<p class=\"wp-block-paragraph\">Email domains are the most common way that people send and receive emails in a professional way. Your business looks a lot more professional with a @yourdomain.com domain instead of an @gmail.com or @yahoo.com address. <b>Many businesses prefer to use their root domain, or main domain, for professional emails because it\u2019s a way to easily verify the email is sent from the company.<\/b><\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> In 2024, <a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/gmail-and-yahoo-inbox-updates-2024\/\">new sender guidelines<\/a> from Gmail prohibit the use of @gmail.com for sending bulk email. This can be viewed as Gmail spoofing. If you want to reach Gmail users, you will need to use your own domain.<\/div>\r\n    <\/div>\r\n\n<p class=\"wp-block-paragraph\">For example, Mailgun\u2019s professional emails are all sent from <b>Mailgun.com<\/b>.<\/p>\n\n<p class=\"wp-block-paragraph\"><b>An email subdomain delivers email from the subdomain instead of the root domain.<\/b> Here\u2019s an example: <b>sam@learn.mailgun.com.<\/b><\/p>\n\n<p class=\"wp-block-paragraph\">Learn.mailgun.com is the subdomain that Mailgun uses to send marketing messages. Every user that signs up for a Mailgun account gets a welcome email from Sam, sent from that address.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">Why should you use an email subdomain?<\/h2>\n\n<p class=\"wp-block-paragraph\">Inbox providers like Gmail, Yahoo, and Outlook care about <b>email reputation<\/b>, which is a grade for how well users interact with your emails. If Gmail sees that their users are highly engaged with your emails, <b>it\u2019s highly likely that you\u2019re following email best practices, and therefore have a positive sender reputation<\/b>. But if users are sending negative signals to Gmail, like marking your email as spam, then that\u2019s bad.<\/p>\n\n<p class=\"wp-block-paragraph\">Your email reputation is based on both <b>domain reputation<\/b> and <b>IP address reputation<\/b>. We wrote more about <a href=\"https:\/\/www.mailgun.com\/de\/blog\/deliverability\/domain-ip-reputation-gmail-care-more-about\/\" target=\"_tabs\" rel=\"noopener noreferrer\">email reputation<\/a> in a separate post, but the important part here is that subdomains have a different reputation than their root domains.<\/p>\n\n<p class=\"wp-block-paragraph\">This is a good thing &#8211; otherwise, <b>the reputation of your <\/b><a href=\"https:\/\/www.mailgun.com\/de\/loesungen\/email-marketing-software\/\" target=\"_tabs\" rel=\"noopener noreferrer\"><b>email marketing<\/b><\/a><b> campaigns could affect whether potential customers receive emails from your sales team.<\/b> Imagine if none of your business emails were delivered to the inbox!<\/p>\n\n<p class=\"wp-block-paragraph\">This is exactly why Mailgun recommends all customers use a subdomain when sending through our service.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">How subdomains improve your deliverability<\/h2>\n\n<p class=\"wp-block-paragraph\">Understanding the impact of subdomains can be a game-changer for improving your deliverability. When launching email campaigns, separating promotional emails from transactional ones through the use of new subdomains can help protect your sender reputation. Largely because it protects your transactional program from the elevated spam complaint rates that go along with the territory of promotional campaigns. <\/p>\n\n<p class=\"wp-block-paragraph\">By assigning different subdomains for different types of emails, such as <a href=\"mailto:promotional@yourdomain.com\" target=\"_tabs\" rel=\"noopener noreferrer\">promotional.yourdomain.com<\/a> and <a href=\"mailto:transactional@yourdomain.com\" target=\"_tabs\" rel=\"noopener noreferrer\">transactional.yourdomain.com<\/a>, you create distinct sender reputations for each type. This segmentation not only helps in maintaining the integrity of your main domain but also enables you to tailor your sender reputation to the specific nature of your emails. This kind of separation diversifies your sender identity and mitigates the risk of being flagged as spam. <\/p>\n\n<p class=\"wp-block-paragraph\">Let\u2019s take a look at this idea in action.<\/p>\n\n<h3 class=\"wp-block-heading\">Best practices: Multiple subdomains in action<\/h3>\n\n<p class=\"wp-block-paragraph\">Using subdomains is easier than you might think. Many of our customers separate their <b>marketing emails<\/b> from their <b>transactional emails<\/b> through subdomains, which means they set up at least two separate subdomains to send different types of emails. This sounds complicated, but it\u2019s actually super easy. Later on, we\u2019ll show you how to set up a Mailgun subdomain step-by-step. Here\u2019s an example domain setup for a fake company, Meowgun.<\/p>\n\n<p class=\"wp-block-paragraph\">Meowgun is a professional company that wants to send business emails from their Meowgun.com domain. They\u2019ve configured it with Google Workspace and set up the proper DNS records.<\/p>\n\n<p class=\"wp-block-paragraph\">Meowgun also wants to send a cat-facts email newsletter, and a password reset email to their users. Here are the domains they added to Mailgun:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>newsletter.meowgun.com<\/li>\n\n\n\n<li>reset.meowgun.com<\/li>\n<\/ul>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> Whether you&#x27;re using SMTP, an API-based ESP, or sending through Outlook or Google Workspace, the name of your subdomain won\u2019t impact your email reputation. What does matter is keeping things simple and clear. Use names like notifications.yourdomain.com or new-email.yourdomain.com , so it\u2019s obvious what kind of messages each one sends. It\u2019ll make life easier when you\u2019re setting things up or checking deliverability later on.<\/div>\r\n    <\/div>\r\n\n<p class=\"wp-block-paragraph\">Meowgun hires an intern to manage their newsletter, and they accidentally send an email blast to a segment of unengaged users. As a result, their Gmail reputation decreases.\u00a0<\/p>\n\n<p class=\"wp-block-paragraph\">But because Meowgun\u2019s newsletter sends through a separate email subdomain, Meowgun.com\u2019s reputation is unaffected &#8211;\u00a0 and their employees continue sending and receiving email without any inboxing problems. It sounds like their intern should <a href=\"https:\/\/www.mailgun.com\/de\/blog\/deliverability\/best-practices-for-successful-email-delivery\/\" target=\"_tabs\" rel=\"noopener noreferrer\">read about email best practices<\/a> before sending the next cat-facts newsletter, though.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">How to use an email subdomain in Mailgun<\/h2>\n\n<p class=\"wp-block-paragraph\">Adding a subdomain to Mailgun is easy! <b>Here\u2019s what you do<\/b>:<\/p>\n\n<ol class=\"wp-block-list\">\n<li>Login to Mailgun and <b>navigate to \u2018Sending\u2019 in the left-hand menu<\/b>.\u00a0<\/li>\n\n\n\n<li>Click the green \u2018Add New Domain\u2019 button in the top right corner of your screen. <b>Note: <\/b>You must add a credit card to your Mailgun account before you\u2019re allowed to add custom domains.<b> If your button is greyed out, then you need to add a credit card before moving on<\/b>.\u00a0<\/li>\n\n\n\n<li>Click \u2018Add Domain\u2019<\/li>\n\n\n\n<li>On the next screen Mailgun provides you with some DNS records to add to your domain. MX Records, <a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/spf-records-basics\/\" target=\"_tabs\" rel=\"noopener noreferrer\">SPF Record<\/a>, <a href=\"https:\/\/www.mailgun.com\/de\/blog\/deliverability\/dkim-verstehen-wie-es-funktioniert\/\" target=\"_tabs\" rel=\"noopener noreferrer\">DKIM Records<\/a><\/li>\n<\/ol>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-primary\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>Pro tip:<\/b>&nbsp;SPF and DKIM aren&#8217;t the only required authentications. Since Inbox Providers (Gmail, Yahoo, Outlook) implemented new sender requirements, DMARC is now required as well. <a href=\"https:\/\/www.mailgun.com\/de\/blog\/dev-life\/e-mail-authentifizierung-einrichten\/\">Here&#8217;s everything you need to know on how to set up all your authentications<\/a> and become a trusted sender that providers let into the inbox.<\/div>\r\n    <\/div>\r\n\n<p class=\"wp-block-paragraph\">Once you\u2019ve added your DNS records and they\u2019ve been verified by Mailgun, <b>which can take up to 48 hours<\/b>, you\u2019re good to go!<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> MX records are recommended for all domains, as they\u2019re a verification step commonly used by ISPs. They are also required if you want to receive email at the same subdomain you added to Mailgun.<\/div>\r\n    <\/div>\r\n\n<p class=\"wp-block-paragraph\">Check out this help article about <a href=\"https:\/\/help.mailgun.com\/hc\/en-us\/articles\/203357040-Can-I-Use-the-Same-Domain-Name-for-Mailgun-and-for-Google-Apps-Or-Another-Email-Server-\" target=\"_tabs\" rel=\"noopener noreferrer\">using Mailgun with a Google Workspace account<\/a>.\u00a0<\/p>\n\n<h2 class=\"wp-block-heading\">Wrapping up<\/h2>\n\n<p class=\"wp-block-paragraph\">Now that we\u2019ve covered what an email subdomain is, why they\u2019re important for you as an email sender, and how to set one up for Mailgun, you\u2019re ready to send some emails. Hopefully, all your questions have been answered, and you aren\u2019t afraid to ask anything else. Onto the next mystery! Happy sending! <\/p>\n\n<p class=\"wp-block-paragraph\">There\u2019s a lot more to email than hitting send. To learn more about using email subdomains, email authentication, and other deliverability issues, check out our deliverability services.<\/p>\n\r\n    <aside data-content-type=\"longform\"  class=\"banner-block longform-spacings rounded-lg shadow-lg px-5 py-6 px-md-6 py-md-7 p-lg-7 bg-light\" data-theme=\"dark\" aria-labelledby=\"banner-block-block_930b839198a6a8214077043d06150e9f\">\r\n                    <p class=\"text-uppercase section-caption text-body-color\">\r\n                Learn about our Deliverability Services            <\/p>\r\n                            <p class=\"h4 text-accent fw-bold\" id=\"banner-block-block_930b839198a6a8214077043d06150e9f\">\r\n                Deliverability Services            <\/p>\r\n                            <div class=\"mb-0 text-body-color\">\r\n                                    <div class=\"content-body mb-0 text-body-color\">Looking to send a high volume of emails? Our email experts can supercharge your email performance. See how we&#x27;ve helped companies like Lyft, Shopify, Github increase their email delivery rates to an average of 97%.<\/div>\r\n                            <\/div>\r\n        \r\n        <div class=\"text-start mt-5\"><a href=\"https:\/\/www.mailgun.com\/de\/loesungen\/services-zur-optimierung-der-zustellbarkeit-lp\/\"  class=\"btn btn-secondary\" >Learn more<\/a><\/div>\r\n    <\/aside>\r\n\r\n","protected":false},"excerpt":{"rendered":"<p>Erfahren Sie alles \u00fcber das Was, Warum und Wie von E-Mail-Subdomains und wie sie die Zustellbarkeit verbessern. Erfahren Sie, wie Sie diese einrichten, warum sie f\u00fcr E-Mail-Service-Provider wichtig sind und wie sie Ihre Performance im Posteingang bei Gmail, Yahoo und anderen gro\u00dfen Plattformen sch\u00fctzen.<\/p>\n","protected":false},"author":20,"featured_media":4074,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[20],"class_list":["post-12994","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-email"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Was ist eine E-Mail-Subdomain? Wie sich Subdomains auf E-Mails auswirken - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"Erfahren Sie, was eine E-Mail-Subdomain ist, wie E-Mail-Subdomains mit der Zustellbarkeit zusammenh\u00e4ngen und warum Top-Absender sie nutzen, um die Domain-Reputation zu sch\u00fctzen und Posteing\u00e4nge zu erreichen.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mailgun.com\/de\/blog\/email\/die-grundlagen-von-e-mail-subdomains\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Was ist eine E-Mail-Subdomain? Wie sich Subdomains auf E-Mails auswirken - Transactional Email API Service For Developers | Mailgun\" \/>\n<meta property=\"og:description\" content=\"Erfahren Sie, was eine E-Mail-Subdomain ist, wie E-Mail-Subdomains mit der Zustellbarkeit zusammenh\u00e4ngen und warum Top-Absender sie nutzen, um die Domain-Reputation zu sch\u00fctzen und Posteing\u00e4nge zu erreichen.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.mailgun.com\/de\/blog\/email\/die-grundlagen-von-e-mail-subdomains\/\" \/>\n<meta property=\"og:site_name\" content=\"Transactional Email API Service For Developers | Mailgun\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-15T18:17:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/MG-Blog-Email.png\" \/>\n\t<meta property=\"og:image:width\" content=\"720\" \/>\n\t<meta property=\"og:image:height\" content=\"448\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.mailgun.com\\\/de\\\/blog\\\/email\\\/die-grundlagen-von-e-mail-subdomains\\\/\",\"url\":\"https:\\\/\\\/www.mailgun.com\\\/de\\\/blog\\\/email\\\/die-grundlagen-von-e-mail-subdomains\\\/\",\"name\":\"Was ist eine E-Mail-Subdomain? 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