{"id":84175,"date":"2025-03-05T19:13:41","date_gmt":"2025-03-05T19:13:41","guid":{"rendered":"https:\/\/mailrelay.com\/glosario\/junk-mail\/"},"modified":"2026-10-21T07:05:23","modified_gmt":"2026-10-21T07:05:23","slug":"junk-mail","status":"publish","type":"glossary","link":"https:\/\/mailrelay.com\/en\/glossary\/junk-mail\/","title":{"rendered":"Junk Mail"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Junk mail<\/strong> (or junk email) is <strong>unwanted email<\/strong>, also called <strong>&#8220;junk&#8221; or &#8220;spam&#8221;<\/strong>: <strong>unsolicited emails<\/strong> that reach the user&#8217;s inbox, usually with <strong>irrelevant or unwanted content.<\/strong> <\/p>\n\n<p class=\"wp-block-paragraph\">This type of email can come from various sources, such as companies that send <a href=\"https:\/\/mailrelay.com\/en\/blog\/2022\/11\/08\/how-to-send-a-newsletter-a-step-by-step-guide\/\">mass emails<\/a> without properly segmenting their audience or malicious senders with fraudulent intentions.<\/p>\n\n<h2 class=\"wp-block-heading\">Characteristics of junk mail<\/h2>\n\n<p class=\"wp-block-paragraph\">To better understand what junk mail is, it helps to know its main characteristics:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Unsolicited<\/strong>: The main characteristic of junk mail is that the recipient has not requested to receive it. This means that the email arrives unexpectedly and <strong>without the recipient&#8217;s explicit consent.<\/strong><\/li>\n\n\n\n<li><strong>Sent in bulk:<\/strong> Junk mail is usually sent in large volumes to a long list of contacts. This is done using email automation tools that allow thousands of emails to be sent in just a few minutes.<\/li>\n\n\n\n<li><strong>Irrelevant content:<\/strong> These emails usually contain information that <strong>is of no interest to the recipient<\/strong>. They can be advertisements for products, services, fake promotions, or even phishing attempts.<\/li>\n\n\n\n<li><strong>Lack of personalization<\/strong>: Unlike well-segmented <a href=\"https:\/\/mailrelay.com\/en\/glossary\/email-marketing-campaign\/\" target=\"_blank\" rel=\"noreferrer noopener\">email marketing campaigns<\/a>, junk mail lacks personalization. It doesn&#8217;t address the user by name or adapt the content to their interests or previous behavior.<\/li>\n\n\n\n<li><strong>Questionable origin<\/strong>: Many times, junk mail comes from unknown senders or email addresses that seem suspicious. This makes it difficult to identify the sender and verify the legitimacy of the message.<\/li>\n<\/ul>\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"864\" src=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/how-to-recognize-junk-mail.jpg\" alt=\"Infographic with five signs of junk mail: you didn't ask for it, it reaches thousands of people at once, content you're not interested in, no personalization and a questionable sender\" class=\"wp-image-107362\" srcset=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/how-to-recognize-junk-mail.jpg 1536w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/how-to-recognize-junk-mail-300x169.jpg 300w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/how-to-recognize-junk-mail-1024x576.jpg 1024w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/how-to-recognize-junk-mail-768x432.jpg 768w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/how-to-recognize-junk-mail-110x62.jpg 110w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/how-to-recognize-junk-mail-60x34.jpg 60w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n\n<div class=\"wp-block-group has-very-light-gray-background-color has-background\" style=\"border-radius:8px;padding-top:24px;padding-right:28px;padding-bottom:24px;padding-left:28px\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Keep your emails out of junk<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Send from your authenticated domain (SPF, DKIM and DMARC) and only to contacts who have given you permission.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-mailrelay-primary-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/mailrelay.com\/en\/signup\/?utm_medium=cta&#038;utm_campaign=junk-mail\">Create a free account<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<h2 class=\"wp-block-heading\">What causes junk mail?<\/h2>\n\n<p class=\"wp-block-paragraph\">Junk mail can have several causes, most notably:<\/p>\n\n<h3 class=\"wp-block-heading\">Unethical marketing practices<\/h3>\n\n<p class=\"wp-block-paragraph\">Some companies resort to buying email lists or illegally collecting addresses to expand their reach. <\/p>\n\n<p class=\"wp-block-paragraph\">These practices go against data protection regulations and the informed consent of users.<\/p>\n\n<h3 class=\"wp-block-heading\">Malicious intent<\/h3>\n\n<p class=\"wp-block-paragraph\">Cybercriminals use junk mail as a tactic to carry out fraud, such as <a href=\"https:\/\/mailrelay.com\/en\/glossary\/phishing\/\" target=\"_blank\" rel=\"noreferrer noopener\">phishing<\/a>. <\/p>\n\n<p class=\"wp-block-paragraph\">Through emails that look legitimate, they seek to obtain users&#8217; personal or financial information.<\/p>\n\n<h2 class=\"wp-block-heading\">The junk mail folder (Junk Email) in Outlook and Gmail<\/h2>\n\n<p class=\"wp-block-paragraph\">Email programs keep junk mail in a separate folder. In Outlook it&#8217;s called <em>Junk Email<\/em> and in Gmail, &#8220;Spam&#8221;. Sometimes an email you actually wanted ends up there: an invoice, a confirmation or the newsletter you subscribed to.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>To get it out in Outlook:<\/strong> open the Junk Email folder, select the message and choose &#8220;Not junk&#8221;. To keep it from happening again, add the sender to your Safe Senders list.<\/li>\n\n\n\n<li><strong>To get it out in Gmail:<\/strong> open the Spam folder, open the message and click &#8220;Report not spam&#8221;. Gmail automatically deletes anything that has been in that folder for more than 30 days.<\/li>\n\n\n\n<li><strong>If it really is junk mail:<\/strong> mark it as junk or spam instead of deleting it. That way your email provider learns to filter it.<\/li>\n<\/ul>\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"864\" src=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/what-to-do-email-junk-folder.jpg\" alt=\"Infographic with three steps to recover an email from the junk folder: open the folder, mark it as not junk and add the sender to your safe senders\" class=\"wp-image-107366\" srcset=\"https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/what-to-do-email-junk-folder.jpg 1536w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/what-to-do-email-junk-folder-300x169.jpg 300w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/what-to-do-email-junk-folder-1024x576.jpg 1024w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/what-to-do-email-junk-folder-768x432.jpg 768w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/what-to-do-email-junk-folder-110x62.jpg 110w, https:\/\/mailrelay.com\/wp-content\/uploads\/2026\/10\/what-to-do-email-junk-folder-60x34.jpg 60w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">The impact of junk mail on email marketing<\/h2>\n\n<p class=\"wp-block-paragraph\">Junk mail not only hurts the user experience, it also has major repercussions for <a href=\"https:\/\/mailrelay.com\/en\/blog\/2022\/09\/18\/what-is-email-marketing\/\">email marketing<\/a> strategies. <\/p>\n\n<p class=\"wp-block-paragraph\">Below are some of these impacts:<\/p>\n\n<h3 class=\"wp-block-heading\">Distrust in the channel<\/h3>\n\n<p class=\"wp-block-paragraph\">The proliferation of junk emails can cause users to lose trust in email as a communication channel. <\/p>\n\n<p class=\"wp-block-paragraph\">This can lead users to ignore legitimate and relevant emails, affecting the effectiveness of email marketing campaigns.<\/p>\n\n<h3 class=\"wp-block-heading\">Low open rate<\/h3>\n\n<p class=\"wp-block-paragraph\">Emails that end up in the spam folder or are considered junk mail usually have a low open rate. <\/p>\n\n<p class=\"wp-block-paragraph\">This means that important messages don&#8217;t get read, reducing the impact of campaigns.<\/p>\n\n<h3 class=\"wp-block-heading\">Damage to the sender&#8217;s reputation<\/h3>\n\n<p class=\"wp-block-paragraph\">If a company is identified as a sender of junk emails, its reputation can be severely affected. <\/p>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/mailrelay.com\/en\/glossary\/email-service-provider-esp\/\">Email providers<\/a> such as Gmail or Outlook may block or limit the emails they receive from that sender, making it harder to deliver future messages.<\/p>\n\n<h2 class=\"wp-block-heading\">Best Practices to Avoid Junk Mail<\/h2>\n\n<p class=\"wp-block-paragraph\">To keep email marketing campaigns from being classified as junk mail, it&#8217;s worth following a few best practices:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Get the user&#8217;s consent: <\/strong>Before sending any email, you need the recipient&#8217;s explicit consent. This can be achieved through subscription forms where users opt to receive messages.<\/li>\n\n\n\n<li><strong>Segment the audience<\/strong>: Segmentation allows you to send relevant and personalized messages to different user groups. By understanding recipients&#8217; interests and behaviors, you can create more effective and less invasive campaigns.<\/li>\n\n\n\n<li><strong>Personalize the content: <\/strong> Personalizing content is key to capturing the user&#8217;s attention. Using the recipient&#8217;s name, referring to previous purchases, or adapting the message to their interests increases the chances that the email will be opened and read.<\/li>\n\n\n\n<li><strong>Include unsubscribe options: <\/strong> It is important to always provide a clear and easy option for users to unsubscribe from mailing lists. This is not only an ethical practice but also a legal requirement in many jurisdictions.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">How Mailrelay helps you<\/h2>\n\n<p class=\"wp-block-paragraph\">With Mailrelay, your campaigns are less likely to end up in the junk folder. Every subscription goes through double opt-in, unsubscribes are handled automatically and addresses that hard bounce are never sent to again.<\/p>\n\n<p class=\"wp-block-paragraph\">You can also authenticate your domain with SPF and DKIM, and before sending you can run the editor&#8217;s spam report, based on SpamAssassin, which flags problems in the content or links. Emails go out from shared IPs that are monitored continuously.<\/p>\n\n<div class=\"wp-block-group has-very-light-gray-background-color has-background\" style=\"border-radius:8px;padding-top:24px;padding-right:28px;padding-bottom:24px;padding-left:28px\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Reach the inbox, not the junk folder<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mailrelay works with double opt-in and guides you through authenticating your domain.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button is-style-mailrelay-primary-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/mailrelay.com\/en\/signup\/?utm_medium=cta&#038;utm_campaign=junk-mail\">Start for free<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<h2 class=\"wp-block-heading\">Related entries<\/h2>\n\n<ul class=\"wp-block-list\">\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\/antispam-filters\/\">Antispam filters<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/inbox\/\">Inbox<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/email-service-provider-esp\/\">Email service provider<\/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\/spamtraps\/\">Spamtraps<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/blacklist\/\">Blacklist<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/phishing\/\">Phishing<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/spoofing\/\">Spoofing<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/mailrelay.com\/en\/glossary\/can-spam-act\/\">CAN-SPAM Act<\/a><\/li>\n<\/ul>\n","protected":false},"template":"","class_list":["post-84175","glossary","type-glossary","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - 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This type of email can come from various sources, such as companies that send mass emails without properly segmenting their audience or malicious senders with fraudulent intentions. Characteristics of&hellip;","_links":{"self":[{"href":"https:\/\/mailrelay.com\/en\/wp-json\/wp\/v2\/glossary\/84175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mailrelay.com\/en\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/mailrelay.com\/en\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":4,"href":"https:\/\/mailrelay.com\/en\/wp-json\/wp\/v2\/glossary\/84175\/revisions"}],"predecessor-version":[{"id":107561,"href":"https:\/\/mailrelay.com\/en\/wp-json\/wp\/v2\/glossary\/84175\/revisions\/107561"}],"wp:attachment":[{"href":"https:\/\/mailrelay.com\/en\/wp-json\/wp\/v2\/media?parent=84175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}