{"id":142,"date":"2011-11-27T03:46:00","date_gmt":"2011-11-27T03:46:00","guid":{"rendered":"http:\/\/pheonixsolutions.com\/?p=142"},"modified":"2026-05-15T08:40:44","modified_gmt":"2026-05-15T03:10:44","slug":"horde-mail-issue","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/horde-mail-issue\/","title":{"rendered":"Horde mail issue"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you are unable to log in to Horde with the correct email username and password, the issue may be due to missing domain entries in the server configuration files.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Root or SSH access to the server<\/li>\n\n\n\n<li>Access to mail configuration files<\/li>\n\n\n\n<li>Domain and email account configured on the server<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Implementation<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Horde Login Issue<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you cannot log in to Horde for any mail account of the domain using the correct username and password, check the following:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Check the domain entry (domain.com) in the following file:<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">            \/etc\/userdomains<\/p>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>If the domain entry (domain.com) is missing, manually add the domain to this file.<\/li>\n\n\n\n<li>Try logging in to Horde again. The login should work successfully.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Mail Sending Error in Horde<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you can access Horde but encounter the following error while sending emails:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Error:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There was an error sending your message: Failed to add recipient: <a>user@domain.com<\/a> [SMTP: Invalid response code received from server (code: 451, response: Temporary local problem, please try later)]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This issue occurs due to the missing domain entry in the following file:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\/etc\/localdomains<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Add the domain entry (domain.com) to the \/etc\/localdomains file and try sending the email again.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The mail functionality should now work correctly.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">By ensuring the domain entry exists in both \/etc\/userdomains and \/etc\/localdomains, you can resolve Horde login and email-sending issues.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction If you are unable to log in to Horde with the correct email username and password, the issue may 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