{"id":9378,"date":"2026-06-02T05:54:45","date_gmt":"2026-06-02T03:54:45","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=9378"},"modified":"2026-06-02T05:54:46","modified_gmt":"2026-06-02T03:54:46","slug":"recipient-address-rejected-user-unknown-in-local-recipient-table","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/","title":{"rendered":"Recipient address rejected: User unknown in local recipient table"},"content":{"rendered":"\n<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">This error is returned by the mail server when it cannot deliver a message because the recipient mailbox does not exist on the destination server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In simple terms, the server does not recognize the email address you are trying to send to.<\/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\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#Common_causes\" >Common causes<\/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\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#How_email_delivery_is_checked\" >How email delivery is checked<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#How_to_fix_the_issue\" >How to fix the issue<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#1_Check_the_email_address\" >1. Check the email address<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#2_Confirm_mailbox_existence\" >2. Confirm mailbox existence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#3_Try_an_alternative_contact_method\" >3. Try an alternative contact method<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#Practical_implications\" >Practical implications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/recipient-address-rejected-user-unknown-in-local-recipient-table\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_causes\"><\/span>Common causes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<\/div>\n\n<div id=\"mybox-2326881933\" 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\">Early access<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Still need help?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contact our customer service team.<\/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\">Message us<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">This issue usually appears in the following situations:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the recipient mailbox was deleted<\/li>\n\n\n\n<li>the email address was typed incorrectly<\/li>\n\n\n\n<li>the domain has no active mailbox configuration for that address<\/li>\n\n\n\n<li>the recipient has moved their email service to another provider<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_email_delivery_is_checked\"><\/span>How email delivery is checked<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When you send an email, the receiving server verifies whether:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the domain exists<\/li>\n\n\n\n<li>the mailbox is active<\/li>\n\n\n\n<li>the address is correctly configured<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If any of these checks fail, the server rejects the message with this error.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_fix_the_issue\"><\/span>How to fix the issue<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Check_the_email_address\"><\/span>1. Check the email address<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Verify that the recipient address is spelled correctly, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>username<\/li>\n\n\n\n<li>domain name<\/li>\n\n\n\n<li>dots and special characters<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Even a small typo can cause delivery failure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Confirm_mailbox_existence\"><\/span>2. Confirm mailbox existence<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If possible, verify that the recipient mailbox still exists on their email server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the mailbox has been deleted or disabled, the message cannot be delivered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Try_an_alternative_contact_method\"><\/span>3. Try an alternative contact method<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the address is correct but still rejected, the recipient may have:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>changed providers<\/li>\n\n\n\n<li>migrated their mailbox<\/li>\n\n\n\n<li>disabled the account<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In this case, request an updated email address.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Practical_implications\"><\/span>Practical implications<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>the issue is always on the recipient side, not the sender<\/li>\n\n\n\n<li>messages are not delivered or stored in a queue<\/li>\n\n\n\n<li>retrying without changes will not resolve the error<\/li>\n<\/ul>\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\">The \u201cUser unknown in local recipient table\u201d error means the recipient email address does not exist or is not recognized by the destination mail server. It is typically caused by a typo, deleted mailbox, or inactive domain configuration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[45],"manual_kb_tag":[5571,5572,5573,5574,5575,5576,1433,1439,5569,5570],"class_list":["post-9378","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-errors-sending-messages","manual_kb_tag-recipient-not-found","manual_kb_tag-mailbox-deleted","manual_kb_tag-incorrect-email-address","manual_kb_tag-email-address-typo","manual_kb_tag-inactive-domain-configuration","manual_kb_tag-mail-server-error","manual_kb_tag-recipient-address-rejected","manual_kb_tag-email-delivery-failure","manual_kb_tag-user-unknown-in-local-recipient-table","manual_kb_tag-recipient-mailbox-does-not-exist"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/9378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":1,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/9378\/revisions"}],"predecessor-version":[{"id":9379,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/9378\/revisions\/9379"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/media?parent=9378"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manualknowledgebasecat?post=9378"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb_tag?post=9378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}