{"id":3570,"date":"2026-10-07T14:26:29","date_gmt":"2026-10-07T14:26:29","guid":{"rendered":"https:\/\/www.ucartz.com\/blog\/what-is-an-email-domain\/"},"modified":"2026-10-07T14:26:38","modified_gmt":"2026-10-07T14:26:38","slug":"what-is-an-email-domain","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/blog\/what-is-an-email-domain\/","title":{"rendered":"What Is an Email Domain? Free vs Custom Domain Email"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Short answer:<\/strong> the email domain is the part of an address after the @. In <code>asha@ashasbakery.com<\/code>, the domain is <code>ashasbakery.com<\/code>. It decides which mail servers receive messages for that address (through the domain&#8217;s MX records) and which servers may send mail in its name (through SPF, DKIM and DMARC). With a free address, the domain belongs to the provider, such as <code>gmail.com<\/code>. With a custom domain email, it is your own domain, and you choose who hosts the mailboxes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"387\" src=\"https:\/\/www.ucartz.com\/blog\/wp-content\/uploads\/2026\/10\/what-is-an-email-domain-screenshot-1024x387.png\" alt=\"Terminal showing dig lookups of Gmail&#039;s MX servers, example.com&#039;s null MX and SPF record, and Gmail&#039;s DMARC policy\" class=\"wp-image-3572\" srcset=\"https:\/\/www.ucartz.com\/blog\/wp-content\/uploads\/2026\/10\/what-is-an-email-domain-screenshot-1024x387.png 1024w, https:\/\/www.ucartz.com\/blog\/wp-content\/uploads\/2026\/10\/what-is-an-email-domain-screenshot-300x113.png 300w, https:\/\/www.ucartz.com\/blog\/wp-content\/uploads\/2026\/10\/what-is-an-email-domain-screenshot-768x290.png 768w, https:\/\/www.ucartz.com\/blog\/wp-content\/uploads\/2026\/10\/what-is-an-email-domain-screenshot.png 1100w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Real DNS lookups on a Debian 13 server: Gmail&#039;s MX servers in priority order, example.com&#039;s null MX and SPF record, and Gmail&#039;s DMARC policy.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">The parts of an email address<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The email message standard, <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc5322\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 5322<\/a>, defines an address as a locally interpreted string, then the @ sign, then an internet domain:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Part<\/th><th>Example<\/th><th>What it is<\/th><\/tr><\/thead><tbody><tr><td>Local part<\/td><td><code>asha<\/code><\/td><td>The mailbox name, chosen by whoever runs the domain<\/td><\/tr><tr><td>@<\/td><td><code>@<\/code><\/td><td>The separator<\/td><\/tr><tr><td>Domain<\/td><td><code>ashasbakery.com<\/code><\/td><td>Where the mail goes, looked up in DNS<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Capital letters are treated differently in the two halves. The SMTP standard, <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc5321\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 5321<\/a>, says mail servers must preserve the case of the local part, because for some hosts <code>smith<\/code> and <code>Smith<\/code> are different users, though it discourages relying on that. The domain follows normal DNS rules and is not case-sensitive, so <code>ASHASBAKERY.COM<\/code> and <code>ashasbakery.com<\/code> are the same.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How the domain decides where email goes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When someone sends you a message, their mail server looks up the MX (mail exchange) records of your domain. RFC 5321 describes the rules:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Each MX record names a mail server and a preference number. The lowest number is tried first.<\/li>\n\n\n\n<li>If a domain has no MX records at all, the sender falls back to the domain&#8217;s own address record (the &#8220;implicit MX&#8221;).<\/li>\n\n\n\n<li>A domain that accepts no email can say so with a &#8220;null MX&#8221; record, <code>0 .<\/code>, defined in <a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc7505\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 7505<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">You can see both cases with <code>dig<\/code>. This is what we got on Debian 13:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ dig +short MX gmail.com\n5 gmail-smtp-in.l.google.com.\n10 alt1.gmail-smtp-in.l.google.com.\n20 alt2.gmail-smtp-in.l.google.com.\n30 alt3.gmail-smtp-in.l.google.com.\n40 alt4.gmail-smtp-in.l.google.com.\n\n$ dig +short MX example.com\n0 .<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>gmail.com<\/code> has five mail servers, tried in order from preference 5. <code>example.com<\/code> publishes a null MX: it accepts no mail at all. (We sorted the Gmail lines by preference; <code>dig<\/code> may print them in any order.)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Free address or your own domain?<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><\/th><th>Free address (you@gmail.com)<\/th><th>Your own domain (you@yourbusiness.com)<\/th><\/tr><\/thead><tbody><tr><td>Cost<\/td><td>Free<\/td><td>A domain plus email hosting<\/td><\/tr><tr><td>Looks like<\/td><td>A personal account<\/td><td>Your business<\/td><\/tr><tr><td>Keep the address if you change provider<\/td><td>No<\/td><td>Yes: point the MX records at the new host<\/td><\/tr><tr><td>Extra addresses (sales@, support@)<\/td><td>Separate accounts<\/td><td>As many as your plan allows, plus aliases and forwarders<\/td><\/tr><tr><td>Send newsletters or app email from your own servers<\/td><td>Not in the provider&#8217;s name: Google asks senders not to impersonate Gmail From: addresses<\/td><td>Yes, once SPF, DKIM and DMARC are set up<\/td><\/tr><tr><td>Who controls the accounts<\/td><td>The provider<\/td><td>You<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The sending row matters more than it used to. Google&#8217;s <a href=\"https:\/\/support.google.com\/a\/answer\/81126\" target=\"_blank\" rel=\"noopener noreferrer\">email sender guidelines<\/a> require every sender to set up SPF or DKIM for their sending domain, and senders of more than 5,000 messages a day to Gmail accounts to set up SPF, DKIM and DMARC, with the From: domain aligned with the SPF or DKIM domain. You can only do that for a domain you control. There is a checklist in <a href=\"https:\/\/www.ucartz.com\/clients\/knowledgebase\/9243\/Gmail-Yahoo-and-Microsoft-requirements-for-bulk-senders-a-checklist.html\">requirements for bulk senders<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What you need for email on your own domain<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>A domain name.<\/strong> If you already have a website, you can use the same domain.<\/li>\n\n\n\n<li><strong>Somewhere to host the mailboxes.<\/strong> Common choices are the email included with a web hosting plan, a service such as Google Workspace, or your own mail server.<\/li>\n\n\n\n<li><strong>DNS records<\/strong> that point mail to that host and prove your mail is genuine (next section).<\/li>\n\n\n\n<li><strong>Your mail app set up<\/strong> with the host&#8217;s IMAP and SMTP details. For the choice between protocols, see <a href=\"https:\/\/www.ucartz.com\/clients\/knowledgebase\/9288\/POP3-vs-IMAP-Which-Should-You-Use-for-Your-Email.html\">POP3 vs IMAP<\/a>; for ports, <a href=\"https:\/\/www.ucartz.com\/clients\/knowledgebase\/2366\/What-is-SMTP-port-number-25-587-465-2525.html\">SMTP port numbers<\/a>.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">The four DNS records behind a custom email domain<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Record<\/th><th>Where<\/th><th>Example value<\/th><th>What it does<\/th><\/tr><\/thead><tbody><tr><td>MX<\/td><td><code>example.com<\/code><\/td><td><code>10 mail.example.com.<\/code><\/td><td>Tells other servers where to deliver your mail<\/td><\/tr><tr><td>SPF (TXT)<\/td><td><code>example.com<\/code><\/td><td><code>v=spf1 mx -all<\/code><\/td><td>Lists the servers allowed to send as your domain; this one allows only your MX hosts (<a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc7208\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 7208<\/a>)<\/td><\/tr><tr><td>DKIM (TXT)<\/td><td><code>selector._domainkey.example.com<\/code><\/td><td>A public key from your email host<\/td><td>Lets receivers check a signature on each message (<a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc6376\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 6376<\/a>)<\/td><\/tr><tr><td>DMARC (TXT)<\/td><td><code>_dmarc.example.com<\/code><\/td><td><code>v=DMARC1; p=none; rua=mailto:dmarc-reports@example.com<\/code><\/td><td>Says what to do when SPF and DKIM fail, and where to send reports (<a href=\"https:\/\/www.rfc-editor.org\/rfc\/rfc9989\" target=\"_blank\" rel=\"noopener noreferrer\">RFC 9989<\/a>)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Your email host gives you the exact values; the ones above only show the format. The DMARC policy <code>p=<\/code> can be <code>none<\/code>, <code>quarantine<\/code> or <code>reject<\/code>. Start with <code>none<\/code>, read the reports, and tighten it once you know every service that sends as your domain passes: see <a href=\"https:\/\/www.ucartz.com\/clients\/knowledgebase\/9236\/How-to-publish-DMARC-for-your-sending-domains-and-tighten-the-policy-safely.html\">how to tighten DMARC safely<\/a>. For what each record does in more depth, read <a href=\"https:\/\/www.ucartz.com\/blog\/email-security-spf-dkim-dmarc-complete-guide\/\">what SPF, DKIM and DMARC actually do<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Check any domain&#8217;s email setup<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>dig +short MX example.com                 # where mail is delivered\ndig +short TXT example.com | grep spf1    # the SPF record\ndig +short TXT _dmarc.example.com         # the DMARC policy<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">For <code>example.com<\/code>, the SPF record came back as <code>\"v=spf1 -all\"<\/code>, which says no server may send mail for it: a sensible record for a domain that never sends email. More lookup tools are in <a href=\"https:\/\/www.ucartz.com\/clients\/knowledgebase\/9279\/DNS-Lookup-Commands-How-to-Use-dig-nslookup-and-host.html\">DNS lookup commands<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common mistakes with email domains<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Two SPF records.<\/strong> When you add a new sending service, merge it into your existing SPF record instead of adding a second one. RFC 7208 says a domain must not have more than one, and receivers treat two as a permanent error.<\/li>\n\n\n\n<li><strong>Losing email when you move your website.<\/strong> If you change nameservers, copy the MX, SPF, DKIM and DMARC records to the new DNS host first, or mail will stop arriving.<\/li>\n\n\n\n<li><strong>Jumping to <code>p=reject<\/code> too early.<\/strong> A service you forgot, such as your invoicing tool, suddenly has its mail rejected.<\/li>\n\n\n\n<li><strong>Letting the domain expire.<\/strong> Your email stops with it, and whoever registers the domain next can receive mail sent to your old addresses.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">To get started, find a name with our <a href=\"https:\/\/www.ucartz.com\/domain-search\">domain search<\/a>. Our <a href=\"https:\/\/www.ucartz.com\/buy-hosting\">web hosting<\/a> plans include email on your domain, and you can also get <a href=\"https:\/\/www.ucartz.com\/clients\/store\/Google-Workspace\">Google Workspace<\/a> from us if you prefer Gmail&#8217;s interface with your own domain. Setting up Workspace in cPanel? <a href=\"https:\/\/www.ucartz.com\/clients\/knowledgebase\/9172\/How-to-add-Google-Workspace-DNS-records-MX-SPF-DKIM-DMARC-in-cPanel.html\">This guide lists every DNS record you need<\/a>, and <a href=\"https:\/\/www.ucartz.com\/blog\/business-email-setup-guide\/\">how to set up business email<\/a> covers the rest.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>What the domain in an email address does, free vs custom domain email, and the MX, SPF, DKIM and DMARC records you need for email on your own domain.<\/p>\n","protected":false},"author":16,"featured_media":3571,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[467,255],"tags":[984,983,473,474,982,985,472],"class_list":["post-3570","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-business","category-domain","tag-business-email","tag-custom-email","tag-dkim","tag-dmarc","tag-email-domain","tag-mx-record","tag-spf"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is an Email Domain? 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