{"id":471,"date":"2025-12-18T07:57:16","date_gmt":"2025-12-18T06:57:16","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=471"},"modified":"2026-06-07T16:48:05","modified_gmt":"2026-06-07T14:48:05","slug":"cum-functioneaza-greylisting-protectia-anti-spam","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/","title":{"rendered":"Cum func\u021bioneaz\u0103 Greylisting? Protec\u021bie anti-spam"},"content":{"rendered":"<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">Greylisting is an anti-spam technique used by mail servers to reduce the number of unwanted messages reaching your inbox. It works by temporarily rejecting messages from previously unknown senders and requiring the sending server to retry delivery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because legitimate mail servers are designed to retry delivery automatically, while many spam systems are not, Greylisting can be a highly effective method of filtering spam.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Contents\" >Contents<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#How_Does_Greylisting_Work\" >How Does Greylisting Work?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Step-by-Step_Process\" >Step-by-Step Process<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Why_Is_Greylisting_Effective\" >Why Is Greylisting Effective?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Trusted_Senders\" >Trusted Senders<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Advantages_of_Greylisting\" >Advantages of Greylisting<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Effective_Spam_Reduction\" >Effective Spam Reduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#No_Content_Analysis_Required\" >No Content Analysis Required<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Low_False_Positive_Rate\" >Low False Positive Rate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Additional_Layer_of_Protection\" >Additional Layer of Protection<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Potential_Disadvantages\" >Potential Disadvantages<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Delivery_Delays\" >Delivery Delays<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Not_Suitable_for_Time-Critical_Communication\" >Not Suitable for Time-Critical Communication<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Additional_Information\" >Additional Information<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#How_to_Enable_Greylisting_in_the_mybox_Panel\" >How to Enable Greylisting in the mybox Panel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/how-does-greylisting-work-anti-spam-protection\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Contents\"><\/span>Contents<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>How Does Greylisting Work?<\/li>\n\n\n\n<li>Why Is Greylisting Effective?<\/li>\n\n\n\n<li>Advantages and Disadvantages<\/li>\n\n\n\n<li>How to Enable Greylisting in the mybox Panel<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_Greylisting_Work\"><\/span>How Does Greylisting Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<\/div>\n\n<div id=\"mybox-2213855947\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Acces timpuriu<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Mai ave\u021bi nevoie de ajutor?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contacta\u021bi echipa noastr\u0103 de servicii pentru clien\u021bi.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Trimite mesaj<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">When an email server attempts to deliver a message, the receiving server can respond in one of three ways:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Accept the message.<\/li>\n\n\n\n<li>Reject the message permanently.<\/li>\n\n\n\n<li>Reject the message temporarily and request a retry.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Greylisting uses the third option.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step-by-Step_Process\"><\/span>Step-by-Step Process<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>A message arrives from an unknown sending server.<\/li>\n\n\n\n<li>The receiving server temporarily rejects the message using a temporary SMTP error.<\/li>\n\n\n\n<li>The sending server receives the temporary rejection and is instructed to try again later.<\/li>\n\n\n\n<li>Legitimate mail servers automatically retry delivery after a short delay.<\/li>\n\n\n\n<li>When the retry occurs, the receiving server recognizes the sender and accepts the message.<\/li>\n\n\n\n<li>The sending server may then be temporarily added to a trusted list, allowing subsequent messages to be delivered without additional delays.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Is_Greylisting_Effective\"><\/span>Why Is Greylisting Effective?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Greylisting is effective because most spam systems are designed to send very large volumes of email as quickly as possible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many spam-sending systems:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do not retry delivery.<\/li>\n\n\n\n<li>Ignore temporary SMTP errors.<\/li>\n\n\n\n<li>Move on to the next target immediately.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Legitimate mail servers, however, follow SMTP standards and automatically retry message delivery after receiving a temporary rejection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As a result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Legitimate messages are eventually delivered.<\/li>\n\n\n\n<li>Many spam messages are never retried and therefore never reach the recipient.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Trusted_Senders\"><\/span>Trusted Senders<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modern Greylisting systems often maintain lists of trusted mail servers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Messages originating from well-known providers may bypass Greylisting entirely.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include mail servers operated by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Google<\/li>\n\n\n\n<li>Microsoft<\/li>\n\n\n\n<li>Yahoo<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This helps reduce delays for commonly used email services.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advantages_of_Greylisting\"><\/span>Advantages of Greylisting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Effective_Spam_Reduction\"><\/span>Effective Spam Reduction<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Greylisting can significantly reduce unwanted email before it reaches the mailbox.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"No_Content_Analysis_Required\"><\/span>No Content Analysis Required<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike some spam filters, Greylisting does not inspect message content.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Low_False_Positive_Rate\"><\/span>Low False Positive Rate<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Legitimate mail servers usually retry delivery automatically, allowing valid messages to be delivered successfully.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Additional_Layer_of_Protection\"><\/span>Additional Layer of Protection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Greylisting works alongside other anti-spam technologies such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SPF<\/li>\n\n\n\n<li>DKIM<\/li>\n\n\n\n<li>RBL<\/li>\n\n\n\n<li>CleanBox<\/li>\n\n\n\n<li>MXFILTER<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Potential_Disadvantages\"><\/span>Potential Disadvantages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Delivery_Delays\"><\/span>Delivery Delays<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The primary drawback is that the first message from a new sender may be delayed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on the sending server&#8217;s retry schedule, the delay can range from:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>A few minutes to several hours<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Not_Suitable_for_Time-Critical_Communication\"><\/span>Not Suitable for Time-Critical Communication<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If immediate delivery is essential, Greylisting may not be the ideal solution.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Additional_Information\"><\/span>Additional Information<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">More information about Greylisting can be found at:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.greylisting.org?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noopener\">Greylisting.org<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Enable_Greylisting_in_the_mybox_Panel\"><\/span>How to Enable Greylisting in the mybox Panel<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To enable Greylisting:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Log in to the mybox Panel.<\/li>\n\n\n\n<li>Navigate to:<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>Email<\/code><\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>Open the list of mailboxes.<\/li>\n\n\n\n<li>Select the mailbox you want to configure.<\/li>\n\n\n\n<li>Open the:<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>Spam Filters<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">tab.<\/p>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li>Locate the Greylisting option and enable it.<\/li>\n\n\n\n<li>Save the changes.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">The anti-spam protection will begin working immediately after activation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Greylisting is an effective anti-spam mechanism that temporarily rejects messages from unknown senders and requires the sending server to retry delivery.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because legitimate mail servers automatically retry while many spam systems do not, Greylisting can significantly reduce unwanted email.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Benefits include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Effective spam filtering.<\/li>\n\n\n\n<li>Low false positive rates.<\/li>\n\n\n\n<li>No message content analysis required.<\/li>\n\n\n\n<li>Additional protection alongside SPF, DKIM, RBL, and other anti-spam technologies.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The main trade-off is a potential delay in receiving the first message from a previously unknown sender.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[41,44,45],"manual_kb_tag":[3107,3108,3109,3110,3111,191,246,286,1420,1425],"class_list":["post-471","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-email","manualknowledgebasecat-errors-receiving-messages","manualknowledgebasecat-errors-sending-messages","manual_kb_tag-email-greylisting","manual_kb_tag-spam-prevention","manual_kb_tag-delivery-retries","manual_kb_tag-trusted-servers","manual_kb_tag-mailbox-validation","manual_kb_tag-antispam","manual_kb_tag-email-security","manual_kb_tag-mail-server","manual_kb_tag-greylisting","manual_kb_tag-temporary-rejection"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/471","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":1,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/471\/revisions"}],"predecessor-version":[{"id":9826,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/471\/revisions\/9826"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/media?parent=471"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manualknowledgebasecat?post=471"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb_tag?post=471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}