{"id":84133,"date":"2025-02-28T18:24:34","date_gmt":"2025-02-28T18:24:34","guid":{"rendered":"https:\/\/mailrelay.com\/glosario\/inbox\/"},"modified":"2026-09-26T07:28:39","modified_gmt":"2026-09-26T07:28:39","slug":"inbox","status":"publish","type":"glossary","link":"https:\/\/mailrelay.com\/en\/glossary\/inbox\/","title":{"rendered":"Inbox"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The inbox is the folder in your email account where the messages you receive arrive. It&#8217;s the first thing you see when you open Gmail, Outlook or any other email client. And it&#8217;s also the place every company that sends campaigns wants to reach.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because an email that doesn&#8217;t show up there, in practice, doesn&#8217;t exist for the person receiving it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is an inbox?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The word combines <em>in<\/em> and <em>box<\/em>: the box where incoming mail lands. It works just like a mailbox. Each new message appears at the top. You&#8217;ll usually see the <a href=\"https:\/\/mailrelay.com\/en\/glossary\/sender\/\" target=\"_blank\" rel=\"noopener\">sender<\/a>&#8216;s name, the <a href=\"https:\/\/mailrelay.com\/en\/glossary\/email-subject-line\/\" target=\"_blank\" rel=\"noopener\">subject line<\/a> and the first lines of the text.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, not everything people send you ends up there. Email providers filter every message before showing it to you. The ones that look suspicious go to the <a href=\"https:\/\/mailrelay.com\/en\/glossary\/spam\/\" target=\"_blank\" rel=\"noopener\">spam<\/a> or junk folder.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What does inbox mean on social media?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Outside email, inbox is also used for private messages on social networks. When someone says &#8220;check your inbox&#8221; or &#8220;I&#8217;ll send it to your inbox&#8221;, they may mean a direct message. It could be on Instagram, Facebook Messenger, LinkedIn or TikTok, and only the person receiving it can see it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The idea is the same: a private space where you receive what people write to you. But here we focus on the email inbox, which is the one that matters most in <a href=\"https:\/\/mailrelay.com\/en\/glossary\/email-marketing\/\" target=\"_blank\" rel=\"noopener\">email marketing<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Gmail, Outlook and Apple Mail organize it<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Today it&#8217;s no longer a single list. The big providers split it up so you see what matters first:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/mailrelay.com\/en\/glossary\/gmail-email\/\" target=\"_blank\" rel=\"noopener\">Gmail<\/a>:<\/strong> sorts mail into the Primary, Promotions, Social, Updates and Forums tabs. Newsletters and offers usually land in Promotions.<\/li>\n\n\n\n<li><strong>Outlook:<\/strong> its Focused Inbox splits messages into two tabs, Focused and Other, based on what you usually read.<\/li>\n\n\n\n<li><strong>Apple Mail:<\/strong> since iOS 18.2 it sorts mail into the Primary, Transactions, Updates and Promotions categories.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized-1024x576.png\" alt=\"How Gmail, Outlook and Apple Mail organize the inbox: tabs and categories\" class=\"wp-image-95140\" srcset=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized-1024x576.png 1024w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized-300x169.png 300w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized-768x432.png 768w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized-1536x864.png 1536w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized-110x62.png 110w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized-60x34.png 60w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized.png 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Landing in Promotions isn&#8217;t the same as ending up in spam. Your email has arrived and the user can see it, although it competes with more commercial messages.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The other folders in your email<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Your email client has other folders too, and it&#8217;s worth not mixing them up:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Folder<\/th><th>What it holds<\/th><\/tr><\/thead><tbody><tr><td>Inbox<\/td><td>Received messages the provider considers legitimate<\/td><\/tr><tr><td>Spam or junk<\/td><td>Suspicious messages, or ones users have marked as spam<\/td><\/tr><tr><td>Sent<\/td><td>The emails you&#8217;ve sent<\/td><\/tr><tr><td>Drafts<\/td><td>Messages you started and haven&#8217;t sent yet<\/td><\/tr><tr><td>Trash<\/td><td>What you&#8217;ve deleted, until it&#8217;s emptied<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Why reaching the inbox matters in email marketing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An email being delivered doesn&#8217;t mean it reached the inbox. The server may accept it and still send it to spam. That&#8217;s why there are two different metrics. <a href=\"https:\/\/mailrelay.com\/en\/glossary\/deliverability\/\" target=\"_blank\" rel=\"noopener\">Deliverability<\/a> measures how many emails the server accepts. The <a href=\"https:\/\/mailrelay.com\/en\/glossary\/inbox-placement-rate\/\" target=\"_blank\" rel=\"noopener\">inbox placement rate<\/a> measures how many actually show up there.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The gap isn&#8217;t small. According to research by Validity, an industry reference, roughly one in six legitimate emails never reaches its destination. And if your email isn&#8217;t there, nobody opens it. Your <a href=\"https:\/\/mailrelay.com\/en\/glossary\/open-rate-2\/\" target=\"_blank\" rel=\"noopener\">open rate<\/a>, your clicks and your sales drop along with it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On top of that, every provider decides where to place it based on your <a href=\"https:\/\/mailrelay.com\/en\/glossary\/sender-score-reputation\/\" target=\"_blank\" rel=\"noopener\">sender reputation<\/a>. If your subscribers open and reply, your next sends will have an easier time. If they ignore them or mark them as spam, the opposite happens.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How can you tell where your campaigns end up? A simple way is to send tests to your own Gmail, Outlook and Yahoo accounts and check which folder they land in. It&#8217;s also worth watching opens by provider. If they suddenly drop at one of them, your emails are most likely going to spam.<\/p>\n\n\n\n<div style=\"background:#f2f6ff;border-left:4px solid #2c5cf6;border-radius:8px;padding:24px 28px;margin:28px 0;\"><p style=\"margin:0 0 8px;font-size:19px;font-weight:700;color:#152a52;\">Get your campaigns into the inbox<\/p><p style=\"margin:0 0 16px;font-size:16px;line-height:1.5;color:#333;\">Mailrelay helps you authenticate your domain and keep your list clean to protect your deliverability from the very first send.<\/p><a href=\"https:\/\/mailrelay.com\/en\/signup\/?utm_medium=cta&#038;utm_campaign=inbox-en\" style=\"display:inline-block;background:#2c5cf6;color:#ffffff;text-decoration:none;font-weight:600;padding:12px 26px;border-radius:6px;\">Create a free account<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How to get your emails into the inbox<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">There&#8217;s no single trick. But these practices make a difference:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox-1024x576.png\" alt=\"6 keys to getting your emails into the inbox\" class=\"wp-image-95143\" srcset=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox-1024x576.png 1024w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox-300x169.png 300w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox-768x432.png 768w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox-1536x864.png 1536w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox-110x62.png 110w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox-60x34.png 60w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/6-keys-reaching-the-inbox.png 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Authenticate your domain:<\/strong> set up <a href=\"https:\/\/mailrelay.com\/en\/glossary\/spf-sender-policy-framework\/\" target=\"_blank\" rel=\"noopener\">SPF<\/a>, <a href=\"https:\/\/mailrelay.com\/en\/glossary\/dkim-domainkeys-identified-mail\/\" target=\"_blank\" rel=\"noopener\">DKIM<\/a> and <a href=\"https:\/\/mailrelay.com\/en\/glossary\/dmarc\/\" target=\"_blank\" rel=\"noopener\">DMARC<\/a>. Since 2024, Gmail and Yahoo require it, as we explain in our guide to <a href=\"https:\/\/mailrelay.com\/en\/glossary\/bulk-sender-requirements\/\" target=\"_blank\" rel=\"noopener\">bulk sender requirements<\/a>.<\/li>\n\n\n\n<li><strong>Build a permission-based list:<\/strong> use <a href=\"https:\/\/mailrelay.com\/en\/glossary\/double-opt-in\/\" target=\"_blank\" rel=\"noopener\">double opt-in<\/a> and never buy databases.<\/li>\n\n\n\n<li><strong>Clean your list:<\/strong> remove addresses that <a href=\"https:\/\/mailrelay.com\/en\/glossary\/bounce\/\" target=\"_blank\" rel=\"noopener\">bounce<\/a> and people who haven&#8217;t opened in months.<\/li>\n\n\n\n<li><strong>Take care of your subject line and content:<\/strong> avoid all caps, too many exclamation marks and exaggerated promises, which trigger <a href=\"https:\/\/mailrelay.com\/en\/glossary\/antispam-filters\/\" target=\"_blank\" rel=\"noopener\">antispam filters<\/a>.<\/li>\n\n\n\n<li><strong>Make unsubscribing easy:<\/strong> a visible unsubscribe link keeps people from marking you as spam.<\/li>\n\n\n\n<li><strong>Warm up a new domain or IP:<\/strong> start with small volumes and increase them gradually with <a href=\"https:\/\/mailrelay.com\/en\/glossary\/ip-warming\/\" target=\"_blank\" rel=\"noopener\">IP warming<\/a>.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">If you want to go deeper, check what you need to <a href=\"https:\/\/mailrelay.com\/en\/blog\/2025\/05\/03\/how-to-meet-outlook-gmail-and-yahoo-requirements-to-keep-your-emails-out-of-spam\/\" target=\"_blank\" rel=\"noopener\">meet Outlook, Gmail and Yahoo requirements and keep your emails out of spam<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Mailrelay helps you avoid the spam folder<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">At Mailrelay, deliverability is a priority. We guide you through authenticating your <a href=\"https:\/\/mailrelay.com\/en\/glossary\/sending-domain\/\" target=\"_blank\" rel=\"noopener\">sending domain<\/a> and automatically clean out addresses that bounce. You also see real-time delivery, bounce and unsubscribe stats for every campaign.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And if something doesn&#8217;t work as expected, our support team reviews the case with you by chat, ticket or phone \u2014on the free account too\u2014. That account lets you send up to 80,000 emails a month to 20,000 contacts.<\/p>\n\n\n\n<div style=\"background:#f2f6ff;border-left:4px solid #2c5cf6;border-radius:8px;padding:24px 28px;margin:28px 0;\"><p style=\"margin:0 0 8px;font-size:19px;font-weight:700;color:#152a52;\">Send more and land better, for free<\/p><p style=\"margin:0 0 16px;font-size:16px;line-height:1.5;color:#333;\">Up to 80,000 emails a month and 20,000 contacts for free, with real-time delivery stats and human support.<\/p><a href=\"https:\/\/mailrelay.com\/en\/signup\/?utm_medium=cta&#038;utm_campaign=inbox-en\" style=\"display:inline-block;background:#2c5cf6;color:#ffffff;text-decoration:none;font-weight:600;padding:12px 26px;border-radius:6px;\">Try Mailrelay for free<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions about the inbox<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What does inbox mean?<\/strong> It&#8217;s the folder where you receive your emails. On social media, it&#8217;s also used to talk about private messages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why isn&#8217;t an email reaching my inbox?<\/strong> Most often, the filter has sent it to spam. It can also happen that the sender hasn&#8217;t authenticated their domain or that your mailbox is full. Check your spam folder first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Is it bad if my emails land in Gmail&#8217;s Promotions tab?<\/strong> No. The email has arrived and the user can see it. What you want to avoid is the spam folder.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What&#8217;s the diffrence between the inbox and spam?<\/strong> The first holds messages the provider considers legitimate. Spam collects suspicious ones or those users have marked as unwanted.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related entries<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/inbox-placement-rate\/\">Inbox placement rate<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/spam\/\">Spam<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/deliverability-in-email-marketing\/\">Deliverability in email marketing<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/antispam-filters\/\">Antispam filters<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/sender\/\">Sender<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/graymail\/\">Graymail<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/whitelist\/\">Whitelist<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/gmail-email\/\">Gmail<\/a><\/li>\n<\/ul>\n","protected":false},"template":"","class_list":["post-84133","glossary","type-glossary","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is an Inbox? 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Learn what it means, how Gmail and Outlook organize it and how to keep your emails out of spam.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mailrelay.com\/en\/glossary\/inbox\/\" \/>\n<meta property=\"og:site_name\" content=\"Mailrelay\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Mailrelay\/\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-26T07:28:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/09\/how-the-inbox-is-organized.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1672\" \/>\n\t<meta property=\"og:image:height\" content=\"941\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@mailrelay\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/mailrelay.com\\\/en\\\/glossary\\\/inbox\\\/\",\"url\":\"https:\\\/\\\/mailrelay.com\\\/en\\\/glossary\\\/inbox\\\/\",\"name\":\"What Is an Inbox? 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