{"id":703,"date":"2024-08-29T15:21:08","date_gmt":"2024-08-29T13:21:08","guid":{"rendered":"https:\/\/mailnjoy.com\/blog\/?post_type=glossary&#038;p=703"},"modified":"2024-11-29T11:07:44","modified_gmt":"2024-11-29T10:07:44","slug":"hard-bounce","status":"publish","type":"glossary","link":"https:\/\/mailnjoy.com\/blog\/en\/glossary\/hard-bounce\/","title":{"rendered":"Hard bounce"},"content":{"rendered":"<p><span style=\"font-size: 14pt;\">A <strong>hard bounce<\/strong> is an email marketing concept.<\/span><\/p>\n<p><span style=\"font-size: 14pt;\">It refers to a notification which indicates that a message sent has not been received successfully. In contrast to a soft bounce, a hard bounce is <strong>a notification of definitive failure<\/strong>, indicating that the email address concerned cannot receive any email.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"font-size: 14pt;\">The main cause of this failure notification is the fact that the email address contacted does not exist (or no longer exists).<\/span><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\">The hard bounce notification is generally sent to the email address from which the message was originally sent (the \u201cFROM:\u201d field in the header), by the SMTP server which was supposed to receive the email (the \u201cTO:\u201d field in the header).<\/span><br \/>\n<span style=\"font-size: 14pt;\">In email marketing, it is common practice to customize the header of the email sent to modify the \u201cReturn-Path:\u201d field, thus allowing you to indicate to which email address this bounce notification should be sent in the event of email delivery failure (replacing the sender address). The aim here is to centralize hard bounce messages to a specific email address, which will then be analyzed to identify all invalid addresses of a specific email campaign.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\">From a technical point of view, <strong>a bounce generally consists of a message customized by the SMTP server issuing it, together with a specific return code<\/strong> indicating the precise reason for the bounce. <strong>Among the return codes used by SMTP, \u201c550 5.1.1\u201d is the one most often used to designate a hard bounce<\/strong>.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\"><strong>The hard bounce rate is an important metric in email marketing<\/strong> for evaluating the quality of advertisers, which will be constantly monitored by email routers. If the hard bounce rate is too high, this can be a legitimate reason for the email router to block mailings of one of his customers.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 14pt;\">To ensure that an email address can be used and that it will not generate a hard bounce, an email checker could be used, which will provide this information before a true email is sent.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A hard bounce is an email marketing concept. It refers to a notification which indicates that a message sent has not been received successfully. In contrast to a soft bounce, a hard bounce is a notification of definitive failure, indicating that the email address concerned cannot receive any email. &nbsp; The main cause of this [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"template":"","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"glossary-cat":[],"class_list":["post-703","glossary","type-glossary","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hard bounce : definition and uses<\/title>\n<meta name=\"description\" content=\"What is hard bounce in email marketing. 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